On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, Volumen2D. Appleton, 1888 - 458 páginas |
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Página vi
... developed in an unusual manner are highly variable : specific characters more variable than generic : secondary sexual characters variable - Species of the same genus vary in an analogous manner— Reversions to long - lost characters ...
... developed in an unusual manner are highly variable : specific characters more variable than generic : secondary sexual characters variable - Species of the same genus vary in an analogous manner— Reversions to long - lost characters ...
Página vii
... developed from one and the same source - Reasons for disbeliev- ing in great and abrupt modifications Page 168-204 CHAPTER VIII . INSTINCT . Instincts comparable with habits , but different in their origin - Instincts graduated ...
... developed from one and the same source - Reasons for disbeliev- ing in great and abrupt modifications Page 168-204 CHAPTER VIII . INSTINCT . Instincts comparable with habits , but different in their origin - Instincts graduated ...
Página 4
... developed being or into an elaborately constructed organ ; secondly , the subject of Instinct , or the mental powers of animals ; thirdly , Hybridism , or the infertility of species and the fertility of varieties when intercrossed ; and ...
... developed being or into an elaborately constructed organ ; secondly , the subject of Instinct , or the mental powers of animals ; thirdly , Hybridism , or the infertility of species and the fertility of varieties when intercrossed ; and ...
Página 16
... developed crop , which it glories in inflating , may well excite astonishment and even laughter . The turbit has a short and conical beak , with a line of reversed feathers down the breast ; and it has the habit of continually expanding ...
... developed crop , which it glories in inflating , may well excite astonishment and even laughter . The turbit has a short and conical beak , with a line of reversed feathers down the breast ; and it has the habit of continually expanding ...
Página 18
... developed . Moreover , when birds belonging to two or more distinct breeds are crossed , none of which are blue or have any of the above - specified marks , the mongrel offspring are very apt suddenly to acquire these characters . To ...
... developed . Moreover , when birds belonging to two or more distinct breeds are crossed , none of which are blue or have any of the above - specified marks , the mongrel offspring are very apt suddenly to acquire these characters . To ...
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Términos y frases comunes
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 formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number 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 tend theory tion variability variations varieties vary whilst whole wings young