The Origin of Species by Means of Natural Selection Or, The Preservation of Favored Races in the Struggle for LifeD. Appleton and Company, 1882 - 458페이지 |
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54 페이지
... nests in the spring ) that the winter of 1854-5 destroyed four - fifths of the birds in my own grounds ; and this is a tremendous destruction , when we remember that ten per cent . is an extraordinarily severe mortality from epidemics ...
... nests in the spring ) that the winter of 1854-5 destroyed four - fifths of the birds in my own grounds ; and this is a tremendous destruction , when we remember that ten per cent . is an extraordinarily severe mortality from epidemics ...
57 페이지
... of field - mice , which destroy their combs and nests ; and Col. Newman , who has long attended to the habits of humble - bees , believes that " more than two - thirds of them CHAF . III . 57 Struggle for Existence .
... of field - mice , which destroy their combs and nests ; and Col. Newman , who has long attended to the habits of humble - bees , believes that " more than two - thirds of them CHAF . III . 57 Struggle for Existence .
58 페이지
... nests of humble- bees more numerous than elsewhere , which I attribute to the num- ber of cats that destroy the mice . " Hence it is quite credible that the presence of a feline animal in large numbers in a district might determine ...
... nests of humble- bees more numerous than elsewhere , which I attribute to the num- ber of cats that destroy the mice . " Hence it is quite credible that the presence of a feline animal in large numbers in a district might determine ...
142 페이지
... nest in holes in banks ! In certain other districts , however , this same woodpecker , as Mr. Hudson states , frequents trees , and bores holes in the trunk for its nest . I may mention as another illustration of the varied habits of ...
... nest in holes in banks ! In certain other districts , however , this same woodpecker , as Mr. Hudson states , frequents trees , and bores holes in the trunk for its nest . I may mention as another illustration of the varied habits of ...
205 페이지
... nests . An action , which we ourselves require expe- rience to enable us to perform , when performed by an animal , more especially by a very young one , without experience , and when per- formed by many individuals in the same way ...
... nests . An action , which we ourselves require expe- rience to enable us to perform , when performed by an animal , more especially by a very young one , without experience , and when per- formed by many individuals in the same way ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formations formerly forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed theory tion variability variations varieties vary whilst whole wings young