The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432페이지 |
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7 페이지
... breed freely under confine- ment , even when the male and female unite . How many animals there are which will not breed , though kept in an almost free state in their native country ! This is generally , but erroneously , attributed to ...
... breed freely under confine- ment , even when the male and female unite . How many animals there are which will not breed , though kept in an almost free state in their native country ! This is generally , but erroneously , attributed to ...
8 페이지
... Breeders believe that long limbs are almost always accompanied by an elongated head . Some instances of correlation are quite whimsical : thus cats which are entirely white and have blue eyes are generally deaf ; but it has been lately ...
... Breeders believe that long limbs are almost always accompanied by an elongated head . Some instances of correlation are quite whimsical : thus cats which are entirely white and have blue eyes are generally deaf ; but it has been lately ...
10 페이지
... breeds are often transmitted , either exclu- sively or in a much greater degree , to the males alone . A much more important rule , which I think may be trusted , is that , at what- ever period of life a peculiarity first appears , it ...
... breeds are often transmitted , either exclu- sively or in a much greater degree , to the males alone . A much more important rule , which I think may be trusted , is that , at what- ever period of life a peculiarity first appears , it ...
11 페이지
... breed our cart and race - horses , long and short - horned cattle , and poultry of various breeds , and esculent vegetables , for an unlimited number of generations , would be opposed to all experience . Character of Domestic Varieties ...
... breed our cart and race - horses , long and short - horned cattle , and poultry of various breeds , and esculent vegetables , for an unlimited number of generations , would be opposed to all experience . Character of Domestic Varieties ...
12 페이지
... breeds of the dog has been produced under domestication ; I believe that a small part of the difference is due to ... breeds ; and that some of these ancient breeds closely resemble , or are even identical with , those still exist- ing ...
... breeds of the dog has been produced under domestication ; I believe that a small part of the difference is due to ... breeds ; and that some of these ancient breeds closely resemble , or are even identical with , those still exist- ing ...
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase 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 resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young