The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432 páginas |
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Página 13
... breeds . In regard to sheep and goats I can form no decided opinion . From facts communicated to me by Mr. Blyth , on the habits , voice , con- stitution , and structure of the humped Indian cattle , it is almost certain that they are ...
... breeds . In regard to sheep and goats I can form no decided opinion . From facts communicated to me by Mr. Blyth , on the habits , voice , con- stitution , and structure of the humped Indian cattle , it is almost certain that they are ...
Página 14
... breeds of cattle , sheep , etc. , we must admit that many domestic breeds must have originated in Europe ; from whence otherwise could they have been derived ? So it is in India . Even in the case of the breeds of the domestic dog ...
... breeds of cattle , sheep , etc. , we must admit that many domestic breeds must have originated in Europe ; from whence otherwise could they have been derived ? So it is in India . Even in the case of the breeds of the domestic dog ...
Página 15
... breeds is something astonishing . Compare the English carrier and the short - faced tumbler , and see the wonderful difference in their beaks , entailing corresponding differences in their skulls . The carrier , more espe- cially the ...
... breeds is something astonishing . Compare the English carrier and the short - faced tumbler , and see the wonderful difference in their beaks , entailing corresponding differences in their skulls . The carrier , more espe- cially the ...
Página 16
... breeds several truly - inherited sub - breeds , or species , as he would call them , could be shown him . Great as are the differences between the breeds of the pigeon , I am fully convinced that the common opinion of naturalists is ...
... breeds several truly - inherited sub - breeds , or species , as he would call them , could be shown him . Great as are the differences between the breeds of the pigeon , I am fully convinced that the common opinion of naturalists is ...
Página 17
... breeds have been transported to all parts of the world , and , therefore , some of them must have been carried back again into their native country ; but not one has become wild or feral , though the dovecot - pigeon , which is the rock ...
... breeds have been transported to all parts of the world , and , therefore , some of them must have been carried back again into their native country ; but not one has become wild or feral , though the dovecot - pigeon , which is the rock ...
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Términos y frases comunes
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