L'origen de les espècies (ed. 2)
- Idioma:
- anglès
- Completesa:
- Selecció o obra parcial
- Autoria:
- Escrita per l'autor
- Estat del text:
- Sense soroll d'escaneig detectat (mesura automàtica sobre tot el text, no revisada a mà)
- Extensió:
- ~170.000 paraules · 804 passatges
Cita aquesta obra
- APACharles Darwin. (n.d.). On the Origin of Species by Means of Natural Selection [L'origen de les espècies (ed. 2)]. Digital reproduction: SigPhi. https://sigphiai.com/ca/works/charles-darwin/on-the-origin-of-species-by-means-of-natural-selection
- MLACharles Darwin. On the Origin of Species by Means of Natural Selection [L'origen de les espècies (ed. 2)]. Digital reproduction, SigPhi, https://sigphiai.com/ca/works/charles-darwin/on-the-origin-of-species-by-means-of-natural-selection.
- ChicagoCharles Darwin. On the Origin of Species by Means of Natural Selection [L'origen de les espècies (ed. 2)]. Digital reproduction, SigPhi. https://sigphiai.com/ca/works/charles-darwin/on-the-origin-of-species-by-means-of-natural-selection.
Referència de l’edició reproduïda. SigPhi és la reproducció digital, no l’editor. S’hi inclouen l’any, l’editorial i el traductor quan consten; «n.d.» indica que no consta l’any. La responsabilitat d’un pròleg o d’una nota es determina segons el passatge citat.
De què tracta
Com apareixen les espècies sense que ningú les dissenyi: la selecció natural — més descendents dels que sobreviuen, petites variacions heretables, temps immens — com a mecanisme de tota la diversitat viva.
Context i història
Publicat el novembre del 1859, i esgotat el primer dia. Darwin havia covat la idea vint anys, esporuguit per les seves conseqüències, i només es va decidir a publicar quan Alfred Russel Wallace li va enviar la mateixa teoria des de Malàisia. Va evitar deliberadament parlar de l'ésser humà — «es projectarà molta llum sobre l'origen de l'home», és tot el que va escriure —, però tothom va entendre-ho. Cap llibre de ciència ha canviat tant la manera com l'espècie humana es veu a si mateixa dins la natura, i el debat que va obrir encara no s'ha tancat.
Context editorial, no una font citable: a diferència dels passatges de l'obra, aquestes dades no es poden contrastar amb el corpus.
will almost certainly entail changes in the mature animal. In monstrosities, the correlations between quite distinct parts are very curious; and many instances are given in Isidore Geoffroy St. Hilaire's great work on this subject. Breeders believe that long limbs are almost always accompanied by an elongated head. Some instances of correlation are quite whimsical: thus {12} cats with blue eyes are invariably deaf; colour and constitutional peculiarities go together, of which many remarkable cases could be given amongst animals and plants. From the facts collected by Heusinger, it appears that white sheep and pigs are differently affected from coloured individuals by certain vegetable poisons. Hairless dogs have imperfect teeth: long-haired and coarse-haired animals are apt to have, as is asserted, long or many horns; pigeons with feathered feet have skin between their outer toes; pigeons with short beaks have small feet, and those with long beaks large feet. Hence, if man goes on selecting, and thus augmenting, any peculiarity, he will almost certainly unconsciously modify other parts of the structure, owing to the mysterious laws of the correlation of growth. The result of the various, quite unknown, or dimly seen laws of variation is infinitely complex and diversified. It is well worth while carefully to study the several treatises published on some of our old cultivated plants, as on the hyacinth, potato, even the dahlia, &c.; and it is really surprising to note the endless points in structure and constitution in which the varieties and sub-varieties differ slightly from each other. The whole organisation seems to have become plastic, and tends to depart in some small degree from that of the parental type. Any variation which is not inherited is unimportant for us. But the number and diversity of inheritable deviations of structure, both those of slight and those of considerable physiological importance, is endless. Dr.…