SigPhi · John Dewey

Reconstruction in Philosophy

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It is evident that this development represents merely a transitional stage. It tried, after all, to put the new wine in the old bottles. It did not achieve a free and unbiased formulation of the meaning of the power to direct nature's forces through knowledge--that is, purposeful, experimental action acting to reshape beliefs and institutions. The ancient tradition was still strong enough to project itself unconsciously into men's ways of thinking, and to hamper and compromise the expression of the really modern forces and aims. Essential philosophic reconstruction represents an attempt to state these causes and results in a way freed from incompatible inherited factors. It will regard intelligence not as the original shaper and final cause of things, but as the purposeful energetic re-shaper of those phases of nature and life that obstruct social well-being. It esteems the individual not as an exaggeratedly self-sufficient Ego which by some magic creates the world, but as the agent who is responsible through initiative, inventiveness and intelligently directed labor for re-creating the world, transforming it into an instrument and possession of intelligence.

The train of ideas represented by the Baconian Knowledge is Power thus failed in getting an emancipated and independent expression. These become hopelessly entangled in standpoints and prepossessions that embodied a social, political and scientific tradition with which they were completely incompatible. The obscurity, the confusion of modern philosophy is the product of this attempt to combine two things which cannot possibly be combined either logically or morally. Philosophic reconstruction for the present is thus the endeavor to undo the entanglement and to permit the Baconian aspirations to come to a free and unhindered expression. In succeeding lectures we shall consider the needed reconstruction as it affects certain classic philosophic antitheses, like those of experience and reason, the real and the ideal.

But first we shall have to consider the modifying effect exercised upon philosophy by that changed conception of nature, animate and inanimate, which we owe to the progress of science.

CHAPTER III THE SCIENTIFIC FACTOR IN RECONSTRUCTION OF PHILOSOPHY Philosophy starts from some deep and wide way of responding to the difficulties life presents, but it grows only when material is at hand for making this practical response conscious, articulate and communicable. Accompanying the economic, political and ecclesiastical changes which were alluded to in an earlier lecture, was a scientific revolution enormous in scope and leaving unchanged almost no detail of belief about nature, physical and human. In part this scientific transformation was produced by just the change in practical attitude and temper. But as it progressed, it furnished that change an appropriate vocabulary, congenial to its needs, and made it articulate. The advance of science in its larger generalizations and in its specific detail of fact supplied precisely that intellectual equipment of ideas and concrete fact that was needed in order to formulate, precipitate, communicate and propagate the new disposition. Today, accordingly, we shall deal with those contrasting conceptions of the structure and constitution of Nature, which when they are accepted on the authority of science (alleged or real), form the intellectual framework of philosophy.

_Contrasting_ conceptions of ancient and modern science have been selected. For I see no way in which the truly philosophic import of the picture of the world painted by modern science can be appreciated except to exhibit it in contrast with that earlier picture which gave classic metaphysics its intellectual foundation and confirmation. The world in which philosophers once put their trust was a closed world, a world consisting internally of a limited number of fixed forms, and having definite boundaries externally. The world of modern science is an open world, a world varying indefinitely without the possibility of assignable limit in its internal make-up, a world stretching beyond any assignable bounds externally. Again, the world in which even the most intelligent men of olden times thought they lived was a fixed world, a realm where changes went on only within immutable limits of rest and permanence, and a world where the fixed and unmoving was, as we have already noted, higher in quality and authority than the moving and altering. And in the third place, the world which men once saw with their eyes, portrayed in their imaginations and repeated in their plans of conduct, was a world of a limited number of classes, kinds, forms, distinct in quality (as kinds and species must be distinct) and arranged in a graded order of superiority and inferiority.

It is not easy to recall the image of the universe which was taken for granted in the world tradition. In spite of its dramatic rendering (as in Dante), of the dialectical elaborations of Aristotle and St. Thomas, in spite of the fact that it held men's minds captive until the last three hundred years, and that its overthrow involved a religious upheaval, it is already dim, faded and remote. Even as a separate and abstract thing of theory it is not easy to recover.

As something pervasive, interwoven with all the details of reflection and observation, with the plans and rules of behavior, it is impossible to call it back again. Yet, as best we can, we need to put before our minds a definitely enclosed universe, something which can be called a universe in a literal and visible sense, having the earth at its fixed and unchanging centre and at a fixed circumference the heavenly arch of fixed stars moving in an eternal round of divine ether, hemming in all things and keeping them forever at one and in order. The earth, though at the centre, is the coarsest, grossest, most material, least significant and good (or perfect) of the parts of this closed world. It is the scene of maximum fluctuation and vicissitude. It is the least rational, and therefore the least notable, or knowable; it offers the least to reward contemplation, provoke admiration and govern conduct.

Between this grossly material centre and the immaterial, spiritual and eternal heavens lie a definite series of regions of moon, planets, sun, etc., each of which gains in rank, value, rationality and true being as it is farther from earth and nearer the heavens. Each of these regions is composed of its own appropriate stuff of earth, water, air, fire in its own dominant degree, until we reach the heavenly firmament which transcends all these principles, being constituted, as was just said, of that immaterial, inalterable energy called ether.

Within this tight and pent in universe, changes take place of course.

But they are only of a small number of fixed kinds; and they operate only within fixed limits. Each kind of stuff has its own appropriate motion. It is the nature of earthly things to be heavy, since they are gross, and hence to move downward. Fire and superior things are light and hence move upward to their proper place; air rises only to the plane of the planets, where it then takes its back and forth motion which naturally belongs to it, as is evident in the winds and in respiration.

Ether being the highest of all physical things has a purely circular movement. The daily return of the fixed stars is the closest possible approximation to eternity, and to the self-involved revolution of mind upon its own ideal axis of reason. Upon the earth in virtue of its earthly nature--or rather its lack of virtue--is a scene of mere change. Mere flux, aimless and meaningless, starts at no definite point and arrives at nothing, amounts to nothing. Mere changes of quantity, all purely mechanical changes, are of this kind. They are like the shiftings of the sands by the sea. They may be sensed, but they cannot be "noted" or understood; they lack fixed limits which govern them. They are contemptible. They are casual, the sport of accident.

Only changes which lead to some defined or fixed outcome of form are of any account and can have any account--any _logos_ or reason--made of them. The growth of plants and animals illustrates the highest kind of change which is possible in the sublunary or mundane sphere. They go from one definite fixed form to another. Oaks generate only oaks, oysters only oysters, man only man. The material factor of mechanical production enters in, but enters in as accident to prevent the full consummation of the type of the species, and to bring about the meaningless variations which diversify various oaks or oysters from one another; or in extreme cases to produce freaks, sports, monsters, three-handed or four-toed men. Aside from accidental and undesirable variations, each individual has a fixed career to pursue, a fixed path in which to travel. Terms which sound modern, words like potentiality and development abound in Aristotelian thought, and have misled some into reading into his thought modern meanings. But the significance of these words in classic and medieval thought is rigidly determined by their context. Development holds merely of the course of changes which takes place within a particular member of the species. It is only a name for the predetermined movement from the acorn to the oak tree. It takes place not in things generally but only in some one of the numerically insignificant members of the oak species. Development, evolution, never means, as in modern science, origin of new forms, a mutation from an old species, but only the monotonous traversing of a previously plotted cycle of change. So potentiality never means, as in modern life, the possibility of novelty, of invention, of radical deviation, but only that principle in virtue of which the acorn becomes the oak.

Technically, it is the capacity for movement between opposites. Only the cold can become hot; only the dry can become wet; only the babe can become a man; the seed the full-grown wheat and so on. Potentiality instead of implying the emergence of anything novel means merely the facility with which a particular thing repeats the recurrent processes of its kind, and thus becomes a specific case of the eternal forms in and through which all things are constituted.

In spite of the almost infinite numerical diversity of individuals, there are only a limited number of species, kinds or sorts. And the world is essentially a world which falls into sorts; it is pre-arranged into distinct classes. Moreover, just as we naturally arrange plants and animals into series, ranks and grades, from the lower to the highest, so with all things in the universe. The distinct classes to which things belong by their very nature form a hierarchical order. There are castes in nature. The universe is constituted on an aristocratic, one can truly say a feudal, plan. Species, classes do not mix or overlap--except in cases of accident, and to the result of chaos. Otherwise, everything belongs in advance to a certain class, and the class has its own fixed place in the hierarchy of Being. The universe is indeed a tidy spot whose purity is interfered with only by those irregular changes in individuals which are due to the presence of an obdurate matter that refuses to yield itself wholly to rule and form. Otherwise it is a universe with a fixed place for everything and where everything knows its place, its station and class, and keeps it. Hence what are known technically as final and formal causes are supreme, and efficient causes are relegated to an inferior place. The so-called final cause is just a name for the fact that there is some fixed form characteristic of a class or sort of things which governs the changes going on, so that they tend toward it as their end and goal, the fulfilment of their true nature. The supralunar region is the end or final cause of the proper movements of air and fire; the earth of the motions of crass, heavy things; the oak of the acorn; the mature form in general of the germinal.

The "efficient cause," that which produces and instigates a movement is only some external change as it accidentally gives a kind of push to an immature, imperfect being and starts it moving toward its perfected or fulfilled form. The final cause is the perfected form regarded as the _explanation or reason_ of prior changes. When it is not taken in reference to the changes completed and brought to rest in it, but in itself it is the "formal cause": The inherent _nature_ or character which "makes" or constitutes a thing _what it is_ so far as it truly _is_, namely, what it is so far as it does not change. Logically and practically all of the traits which have been enumerated cohere. Attack one and you attack all. When any one is undermined, all go. This is the reason why the intellectual modification of the last few centuries may truly be called a revolution. It has substituted a conception of the world differing at every point. It makes little matter at what point you commence to trace the difference, you find yourself carried into all other points.

Instead of a closed universe, science now presents us with one infinite in space and time, having no limits here or there, at this end, so to speak, or at that, and as infinitely complex in internal structure as it is infinite in extent. Hence it is also an open world, an infinitely variegated one, a world which in the old sense can hardly be called a universe at all; so multiplex and far-reaching that it cannot be summed up and grasped in any one formula. And change rather than fixity is now a measure of "reality" or energy of being; change is omnipresent. The laws in which the modern man of science is interested are laws of motion, of generation and consequence. He speaks of law where the ancients spoke of kind and essence, because what he wants is a correlation of changes, an ability to detect one change occurring in correspondence with another. He does not try to define and delimit something remaining constant _in_ change. He tries to describe a constant order _of_ change. And while the word "constant" appears in both statements, the meaning of the word is not the same. In one case, we are dealing with something constant in _existence_, physical or metaphysical; in the other case, with something constant in _function_ and operation. One is a form of independent being; the other is a formula of description and calculation of interdependent changes.

In short, classic thought accepted a feudally arranged order of classes or kinds, each "holding" from a superior and in turn giving the rule of conduct and service to an inferior. This trait reflects and parallels most closely the social situation we were considering at the last hour.

We have a fairly definite notion of society as organized upon the feudal basis. The family principle, the principle of kinship is strong, and especially is this true as we ascend in the social scale. At the lower end, individuals may be lost more or less in the mass. Since all are parts of the common herd, there is nothing especial to distinguish their birth. But among the privileged and ruling class the case is quite different. The tie of kinship at once marks a group off externally and gives it distinction, and internally holds all its members together.

Kinship, kind, class, genus are synonymous terms, starting from social and concrete facts and going to the technical and abstract. For kinship is a sign of a common nature, of something universal and permanent running through all particular individuals, and giving them a real and objective unity. Because such and such persons are kin they are _really_, and not merely conventionally, marked off into a class having something unique about it. All contemporary members are bound into an objective unity which includes ancestors and descendants and excludes all who belong to another kin or kind. Assuredly this parcelling out of the world into separate kinds, each having its qualitatively distinct nature in contrast with other species, binding numerically distinct individuals together, and preventing their diversities from exceeding fixed bounds, may without exaggeration be called a projection of the family principle into the world at large.

In a feudally organized society, moreover, each kinship group or species occupies a definite place. It is marked by the possession of a specific _rank_ higher or lower with respect to other grades. This position confers upon it certain privileges, enabling it to enforce certain claims upon those lower in the scale and entailing upon it certain services and homage to be rendered to superiors. The relationship of causation, so to speak, is up and down. Influence, power, proceeds from above to below; the activities of the inferior are performed with respect, quite literally, to what is above. Action and reaction are far from being equal and in opposite directions. All action is of one sort, of the nature of lordship, and proceeds from the higher to the lower.

Reaction is of the nature of subjection and deference and proceeds from lower to higher. The classic theory of the constitution of the world corresponds point by point to this ordering of classes in a scale of dignity and power.

A third trait assigned by historians to feudalism is that the ordering of ranks centres about armed service and the relationship of armed defense and protection. I am afraid that what has already been said about the parallelism of ancient cosmology with social organization may seem a fanciful analogy; and if a comparison is also drawn in this last regard, there will be no doubt in your minds that a metaphor is being forced. Such is truly the case if we take the comparison too literally.

But not so, if we confine our attention to the notion of rule and command implied in both. Attention has already been called to the meaning that is now given the term law--a constant relationship among changes. Nevertheless, we often hear about laws which "govern" events, and it often seems to be thought that phenomena would be utterly disorderly were there not laws to keep them in order. This way of thinking is a survival of reading social relationships into nature--not necessarily a feudal relationship, but the relation of ruler and ruled, sovereign and subject. Law is assimilated to a command or order. If the factor of personal will is eliminated (as it was in the best Greek thought) still the idea of law or universal is impregnated with the sense of a guiding and ruling influence exerted from above on what is naturally inferior to it. The universal governs as the end and model which the artisan has in mind "governs" his movements. The Middle Ages added to this Greek idea of control the idea of a command proceeding from a superior will; and hence thought of the operations of nature as if they were a fulfilment of a task set by one who had authority to direct action.

The traits of the picture of nature drawn by modern science fairly spring by contrast into high relief. Modern science took its first step when daring astronomers abolished the distinction of high, sublime and ideal forces operating in the heavens from lower and material forces actuating terrestrial events. The supposed heterogeneity of substances and forces between heaven and earth was denied. It was asserted that the same laws hold everywhere, that there is homogeneity of material and process everywhere throughout nature. The remote and esthetically sublime is to be scientifically described and explained in terms of homely familiar events and forces. The material of direct handling and observation is that of which we are surest; it is the better known.

Until we can convert the grosser and more superficial observations of far-away things in the heavens into elements identical with those of things directly at hand, they remain blind and not understood. Instead of presenting superior worth, they present only problems. They are not means of enlightenment but challenges. The earth is not superior in rank to sun, moon and stars, but it is equal in dignity, and its occurrences give the key to the understanding of celestial existences. Being _at_ hand, they are also capable of being brought _under_ our hand; they can be manipulated, broken up, resolved into elements which can be managed, combined at will in old and new forms. The net result may be termed, I think, without any great forcing, the substitution of a democracy of individual facts equal in rank for the feudal system of an ordered gradation of general classes of unequal rank.

One important incident of the new science was the destruction of the idea that the earth is the centre of the universe. When the idea of a fixed centre went, there went with it the idea of a closed universe and a circumscribing heavenly boundary. To the Greek sense, just because its theory of knowing was dominated by esthetic considerations, the finite was the perfect. Literally, the finite was the finished, the ended, the completed, that with no ragged edges and unaccountable operations. The infinite or limitless was lacking in character just because it was in-finite. Being everything, it was nothing. It was unformed and chaotic, uncontrolled and unruly, the source of incalculable deviations and accidents. Our present feeling that associates infinity with boundless power, with capacity for expansion that knows no end, with the delight in a progress that has no external limit, would be incomprehensible were it not that interest has shifted from the esthetic to the practical; from interest in beholding a harmonious and complete scene to interest in transforming an inharmonious one. One has only to read the authors of the transition period, say Giordano Bruno, to realize what a pent-in, suffocating sensation they associated with a closed, finite world, and what a feeling of exhilaration, expansion and boundless possibility was aroused in them by the thought of a world infinite in stretch of space and time, and composed internally of infinitesimal infinitely numerous elements. That which the Greeks withdrew from with repulsion they welcomed with an intoxicated sense of adventure. The infinite meant, it was true, something forever untraversed even by thought, and hence something forever unknown--no matter how great attainment in learning. But this "forever unknown" instead of being chilling and repelling was now an inspiring challenge to ever-renewed inquiry, and an assurance of inexhaustible possibilities of progress.

The student of history knows well that the Greeks made great progress in the science of mechanics as well as of geometry. At first sight, it appears strange that with this advance in mechanics so little advance was made in the direction of modern science. The seeming paradox impels us to ask why it was that mechanics remained a separate science, why it was not used in description and explanation of natural phenomena after the manner of Galileo and Newton. The answer is found in the social parallelism already mentioned. Socially speaking, machines, tools, were devices employed by artisans. The science of mechanics had to do with the kind of things employed by human mechanics, and mechanics were base fellows. They were at the lower end of the social scale, and how could light on the heavens, the highest, be derived from them? The application of considerations of mechanics to natural phenomena would moreover have implied an interest in the practical control and utilization of phenomena which was totally incompatible with the importance attached to final causes as fixed determiners of nature. All the scientific reformers of the sixteenth and seventeenth centuries strikingly agree in regarding the doctrine of final causes as _the_ cause of the failure of science. Why? Because this doctrine taught that the processes of nature are held in bondage to certain fixed ends which they must tend to realize. Nature was kept in leading strings; it was cramped down to production of a limited number of stereotyped results. Only a comparatively small number of things could be brought into being, and these few must be similar to the ends which similar cycles of change had effected in the past. The scope of inquiry and understanding was limited to the narrow round of processes eventuating in the fixed ends which the observed world offered to view. At best, invention and production of new results by use of machines and tools must be restricted to articles of transient dignity and bodily, not intellectual, use.

When the rigid clamp of fixed ends was taken off from nature, observation and imagination were emancipated, and experimental control for scientific and practical purposes enormously stimulated. Because natural processes were no longer restricted to a fixed number of immovable ends or results, anything might conceivably happen. It was only a question of what elements could be brought into juxtaposition so that they would work upon one another. Immediately, mechanics ceased to be a separate science and became an organ for attacking nature. The mechanics of the lever, wheel, pulley and inclined plane told accurately what happens when things in space are used to move one another during definite periods of time. The whole of nature became a scene of pushes and pulls, of cogs and levers, of motions of parts or elements to which the formulae of movements produced by well-known machines were directly applicable.

The banishing of ends and forms from the universe has seemed to many an ideal and spiritual impoverishment. When nature was regarded as a set of mechanical interactions, it apparently lost all meaning and purpose. Its glory departed. Elimination of differences of quality deprived it of beauty. Denial to nature of all inherent longings and aspiring tendencies toward ideal ends removed nature and natural science from contact with poetry, religion and divine things. There seemed to be left only a harsh, brutal despiritualized exhibition of mechanical forces. As a consequence, it has seemed to many philosophers that one of their chief problems was to reconcile the existence of this purely mechanical world with belief in objective rationality and purpose--to save life from a degrading materialism. Hence many sought to re-attain by way of an analysis of the process of knowing, or epistemology, that belief in the superiority of Ideal Being which had anciently been maintained on the basis of cosmology. But when it is recognized that the mechanical view is determined by the requirements of an experimental control of natural energies, this problem of reconciliation no longer vexes us.

Fixed forms and ends, let us recall, mark fixed limits to change. Hence they make futile all human efforts to produce and regulate change except within narrow and unimportant limits. They paralyze constructive human inventions by a theory which condemns them in advance to failure. Human activity can conform only to ends already set by nature. It was not till ends were banished from nature that purposes became important as factors in human minds capable of reshaping existence. A natural world that does not subsist for the sake of realizing a fixed set of ends is relatively malleable and plastic; it may be used for this end _or_ that. That nature can be known through the application of mechanical formulae is the prime condition of turning it to human account. Tools, machines are means to be utilized. Only when nature is regarded as mechanical, is systematic invention and construction of machines relevant to nature's activities. Nature is subdued to human purpose because it is no longer the slave of metaphysical and theological purpose.

Bergson has pointed out that man might well be called _Homo Faber_. He is distinguished as the tool-making animal. This has held good since man was man; but till nature was construed in mechanical terms, the making of tools with which to attack and transform nature was sporadic and accidental. Under such circumstances it would not have occurred even to a Bergson that man's tool-making capacity was so important and fundamental that it could be used to define him. The very things that make the nature of the mechanical-physical scientist esthetically blank and dull are the things which render nature amenable to human control.

When qualities were subordinated to quantitative and mathematical relationships, color, music and form disappeared from the object of the scientist's inquiry as such. But the remaining properties of weight, extension, numerable velocity of movement and so on were just the qualities which lent themselves to the substitution of one thing for another, to the conversion of one form of energy into another; to the effecting of transformations. When chemical fertilizers can be used in place of animal manures, when improved grain and cattle can be purposefully bred from inferior animals and grasses, when mechanical energy can be converted into heat and electricity into mechanical energy, man gains power to manipulate nature. Most of all he gains power to frame _new_ ends and aims and to proceed in regular system to their actualization. Only indefinite substitution and convertibility regardless of quality render nature manageable. The mechanization of nature is the condition of a practical and progressive idealism in action.

It thus turns out that the old, old dread and dislike of matter as something opposed to mind and threatening it, to be kept within the narrowest bounds of recognition; something to be denied so far as possible lest it encroach upon ideal purposes and finally exclude them from the real world, is as absurd practically as it was impotent intellectually. Judged from the only scientific standpoint, what it does and how it functions, matter means conditions. To respect matter means to respect the conditions of achievement; conditions which hinder and obstruct and which have to be changed, conditions which help and further and which can be used to modify obstructions and attain ends. Only as men have learned to pay sincere and persistent regard to matter, to the conditions upon which depends negatively and positively the success of all endeavor, have they shown sincere and fruitful respect for ends and purposes. To profess to have an aim and then neglect the means of its execution is self-delusion of the most dangerous sort. Education and morals will begin to find themselves on the same road of advance that say chemical industry and medicine have found for themselves when they too learn fully the lesson of wholehearted and unremitting attention to means and conditions--that is, to what mankind so long despised as material and mechanical. When we take means for ends we indeed fall into moral materialism. But when we take ends without regard to means we degenerate into sentimentalism. In the name of the ideal we fall back upon mere luck and chance and magic or exhortation and preaching; or else upon a fanaticism that will force the realization of preconceived ends at any cost.

I have touched in this lecture upon many things in a cursory way. Yet there has been but one point in mind. The revolution in our conceptions of nature and in our methods of knowing it has bred a new temper of imagination and aspiration. It has confirmed the new attitude generated by economic and political changes. It has supplied this attitude with definite intellectual material with which to formulate and justify itself.

In the first lecture it was noted that in Greek life prosaic matter of fact or empirical knowledge was at a great disadvantage as compared with the imaginative beliefs that were bound up with special institutions and moral habitudes. Now this empirical knowledge has grown till it has broken its low and limited sphere of application and esteem. It has itself become an organ of inspiring imagination through introducing ideas of boundless possibility, indefinite progress, free movement, equal opportunity irrespective of fixed limits. It has reshaped social institutions, and in so far developed a new morale. It has achieved ideal values. It is convertible into creative and constructive philosophy.

Convertible, however, rather than already converted. When we consider how deeply embedded in customs of thought and action the classic philosophy came to be and how congenial it is to man's more spontaneous beliefs, the throes that attended its birth are not to be wondered at.

We should rather wonder that a view so upsetting, so undermining, made its way without more persecutions, martyrdoms and disturbances. It certainly is not surprising that its complete and consistent formulation in philosophy has been long delayed. The main efforts of thinkers were inevitably directed to minimizing the shock of change, easing the strains of transition, mediating and reconciling. When we look back upon almost all of the thinkers of the seventeenth and eighteenth centuries, upon all excepting those who were avowedly sceptical and revolutionary, what strikes us is the amount of traditional subject-matter and method that is to be found even among those who were regarded as most advanced.

Men cannot easily throw off their old habits of thinking, and never can throw off all of them at once. In developing, teaching and receiving new ideas we are compelled to use some of the old ones as tools of understanding and communication. Only piecemeal, step-by-step, could the full import of the new science be grasped. Roughly speaking, the seventeenth century witnessed its application in astronomy and general cosmology; the eighteenth century in physics and chemistry; the nineteenth century undertook an application in geology and the biological sciences.

It was said that it has now become extremely difficult to recover the view of the world which universally obtained in Europe till the seventeenth century. Yet after all we need only recur to the science of plants and animals as it was before Darwin and to the ideas which even now are dominant in moral and political matters to find the older order of conceptions in full possession of the popular mind. Until the dogma of fixed unchangeable types and species, of arrangement in classes of higher and lower, of subordination of the transitory individual to the universal or kind had been shaken in its hold upon the science of life, it was impossible that the new ideas and method should be made at home in social and moral life. Does it not seem to be the intellectual task of the twentieth century to take this last step? When this step is taken the circle of scientific development will be rounded out and the reconstruction of philosophy be made an accomplished fact.

CHAPTER IV CHANGED CONCEPTIONS OF EXPERIENCE AND REASON What is experience and what is Reason, Mind? What is the scope of experience and what are its limits? How far is it a sure ground of belief and a safe guide of conduct? Can we trust it in science and in