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action adapted advantage allied America amount ancient animals appear become believe birds breeds cause chapter characters climate closely colour common compared complex considered continuous crossed descendants developed difficulty distinct domestic doubt Edition effected existing extinct extremely facts favourable fertility flowers formation forms genera genus geological give given groups habits hand Hence History hybrids important increase individuals inhabitants inherited insects instance instincts intermediate islands kinds known land laws less living look male manner means modification namely natural selection naturalists nearly never observed occur offspring organic organisation origin parent perfect period plants points Post present principle probably produced range ranked recent remarked seeds seems seen separated similar single slight sometimes species sterility structure successive supposed tend theory tion variability variations varieties vary Vols whole widely young
Seite 231 - If it could be proved that any part of the structure of any one species had been formed for the exclusive good of another species, it would annihilate my theory, for such could not have been produced through natural selection.
Seite xv - ... species had not been independently created, but had descended, like varieties, from other species. Nevertheless, such a conclusion, even if well founded, would be unsatisfactory, until it could be shown how the innumerable species, inhabiting this world have been modified, so as to acquire that perfection of structure and coadaptation which justly excites our admiration.
Seite 81 - Several writers have misapprehended or objected to the term Natural Selection. Some have even imagined that natural selection induces variability, whereas it implies only the preservation of such variations as arise and are beneficial to the being under its conditions of life.
Seite 210 - If it could be demonstrated that any complex organ existed, which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down.
Seite 146 - The limbs divided into great branches, and these into lesser and lesser branches, were themselves once, when the tree was...
Seite 64 - Hence, as more individuals are produced than can possibly survive, there must in every case be a struggle for existence, either one individual with another of the same species, or with the individuals of ^distinct species, or with the physical conditions of life. It is the doctrine of Malthus applied with manifold force to the whole animal and vegetable kingdoms; for in this case there can be no artificial increase of food, and no prudential restraint from marriage.
Seite 73 - Battle within battle must be continually recurring with varying success; and yet in the...
Seite 414 - Every species has come into existence coincident both in space and time with a pre-existing closely allied species.