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adaptive admit allied animal kingdom appear argument argument from ignorance artificial selection beauty become birds bones cells chapter characters chromatin classification colour consideration constitute continuity correlation course Darwin Darwinian degree difficulty digitigrade distinct division egg-cell evidence in favour explain fact faunas fish formation forms fossils function furnished Gastrula genera hand hypothesis importance individual insects instance instincts karyokinesis kind Lastly less male mammalian mammals matter Metazoa modification natural affinity natural causes natural selection naturalists nucleus objections observed occur organic evolution organic nature Origin of Species ovum peculiar species phenomena plantigrade polar bodies present principle pronuclei pronucleus Protozoa purpose question reason regard remarkable resemblance sexual selection special creation spermatozoon stages structure struggle for existence supposed tail terrestrial theory of descent theory of evolution theory of natural theory of special tion variations Vertebrata vertebrated Wallace whole
Page 427 - I look at the geological record as a history of the world imperfectly kept, and written in a changing dialect; of this history we possess the last volume alone, relating only to two or three countries. Of this volume, only here and there a short chapter has been preserved; and of each page, only here and there a few lines.
Page 225 - There are twenty-six land-birds ; of these, twenty-one, or perhaps twenty-three, are ranked as distinct species, and would commonly be assumed to have been here created: yet the close affinity of most of these birds to American species is manifest in every character, in their habits, gestures, and tones of voice.
Page 226 - Archipelago, and nowhere else, bear so plainly the stamp of affinity to those created in America? There is nothing in the conditions of life, in the geological nature of the islands, in their height or climate, or in the proportions in which the several classes are associated together, which closely resembles the conditions of the South American coast: in fact, there is a considerable dissimilarity in all these respects.
Page 257 - That is to say, in every generation of every species a great many more individuals are born than can possibly survive ; so that there is in consequence a perpetual battle for life going on among all the constituent individuals of 'a.ny given generation. Now, in this struggle for existence, which individuals will be victorious and live ? Assuredly those which are best fitted to live : the weakest and the least fitted to live will succumb and die, while the strongest and the best fitted to live will...
Page 84 - The helix obviously consists of the extreme margin of the ear folded inwards; and this folding appears to be in some manner connected with the whole external ear being permanently pressed backwards. In many monkeys, which do not stand high in the order, as baboons and some species of macacus...
Page 3 - ... ever been done, the great difference between him and most of his predecessors consists in this, — that while to them the discovery or accumulation of facts was an end, to him it is the means. In their eyes it was enough that the facts should be discovered and recorded. In his eyes the value of facts is due to their power of guiding the mind to a further discovery of principles.
Page 90 - It appears as if the posterior molar or wisdom-teeth were tending to become rudimentary in the more civilised races of man. These teeth are rather smaller than the other molars, as is likewise the case with the corresponding teeth in the chimpanzee and orang; and they have only two separate fangs.
Page 436 - ... plants is made possible. A watch could not go, except there were the most exact adjustment in the forms and positions of its wheels ; yet no one would accept it as an explanation of the origin of such forms and positions, that the watch would not go if these were other than they are. If the objector were to suppose that plants were originally fitted to years of various lengths, and that such only have survived to the present time, as had a cycle of a length equal to our present year, or one which...
Page 256 - Not only, then, is the doctrine of the transmutation of species in itself disproved by the best physiological reasonings, but the additional assumptions which are requisite, to enable its advocates to apply it to the explanation of the geological and other phenomena of the earth, are altogether gratuitous and fantastical.