On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1860 - 502페이지 This is the 'second edition' of Darwin's Origin of Species. |
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xii 페이지
... animals and plants - Nature of the checks to increase - Compe- tition universal Effects of climate Protection from the number of individuals - Complex relations of all animals and plants throughout nature - Struggle for life most severe ...
... animals and plants - Nature of the checks to increase - Compe- tition universal Effects of climate Protection from the number of individuals - Complex relations of all animals and plants throughout nature - Struggle for life most severe ...
5 페이지
... animal and vegetable kingdoms . As many more individuals of each species are born than can possibly survive ; and as ... animals ; thirdly , Hybridism , or the infertility of species and the fertility of varieties when intercrossed ; and ...
... animal and vegetable kingdoms . As many more individuals of each species are born than can possibly survive ; and as ... animals ; thirdly , Hybridism , or the infertility of species and the fertility of varieties when intercrossed ; and ...
8 페이지
... animal , and few things more difficult than to get it to breed freely under confinement , even in the many cases when the male and female unite . How many animals there are which will not breed , though living long under not very close ...
... animal , and few things more difficult than to get it to breed freely under confinement , even in the many cases when the male and female unite . How many animals there are which will not breed , though living long under not very close ...
9 페이지
... animals under confinement , I may just mention that carnivorous ani- mals , even from the tropics , breed in this country pretty freely under confinement , with the exception of the plantigrades or bear family ; whereas carnivorous ...
... animals under confinement , I may just mention that carnivorous ani- mals , even from the tropics , breed in this country pretty freely under confinement , with the exception of the plantigrades or bear family ; whereas carnivorous ...
11 페이지
... animal can be named which has not in some country drooping ears ; and the view suggested by some authors , that the drooping is due to the disuse of the muscles of the ear , from the animals not being much alarmed by danger , seems ...
... animal can be named which has not in some country drooping ears ; and the view suggested by some authors , that the drooping is due to the disuse of the muscles of the ear , from the animals not being much alarmed by danger , seems ...
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accumulated adapted affinities allied species America amount analogous ancient animals appear become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo Europe existing exterminated extinct extremely facts favourable Fcap fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons plants pollen present probably produced progenitor racters ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive supposed tend theory tion variability variations varieties vary whole widely