The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권D. Appleton, 1898 |
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v 페이지
... Pigeons , their Differences and Origin- Principles of Selection , anciently followed , their Effects- Methodical and Unconscious Selection - Unknown Origin of our Domestic Productions - Circumstances favourable to Man's power of ...
... Pigeons , their Differences and Origin- Principles of Selection , anciently followed , their Effects- Methodical and Unconscious Selection - Unknown Origin of our Domestic Productions - Circumstances favourable to Man's power of ...
7 페이지
... Pigeons , their Differences and Origin- Principles of Selection , anciently followed , their Effects- Methodical and Unconscious Selection - Unknown Origin of our Domestic Productions - Circumstances favourable to Man's power of ...
... Pigeons , their Differences and Origin- Principles of Selection , anciently followed , their Effects- Methodical and Unconscious Selection - Unknown Origin of our Domestic Productions - Circumstances favourable to Man's power of ...
14 페이지
... pigeons with feathered feet have skin between their outer toes ; pigeons with short beaks have small feet , and those with long beaks large feet . Hence if man goes on selecting , and thus augmenting , any peculiarity , he will almost ...
... pigeons with feathered feet have skin between their outer toes ; pigeons with short beaks have small feet , and those with long beaks large feet . Hence if man goes on selecting , and thus augmenting , any peculiarity , he will almost ...
23 페이지
... pigeons ) quite uniform in character , and everything seems simple enough ; but when these mon- grels are crossed one with another for several genera- tions , hardly two of them are ... pigeons , and some. 4 CHAP . 1. ] 23 DOMESTIC PIGEONS .
... pigeons ) quite uniform in character , and everything seems simple enough ; but when these mon- grels are crossed one with another for several genera- tions , hardly two of them are ... pigeons , and some. 4 CHAP . 1. ] 23 DOMESTIC PIGEONS .
24 페이지
... pigeons , and some of them are very important , as being of considerable antiquity . I have associated with several eminent fanciers , and have been permitted to join two of the London Pigeon Clubs . The diversity of the breeds is ...
... pigeons , and some of them are very important , as being of considerable antiquity . I have associated with several eminent fanciers , and have been permitted to join two of the London Pigeon Clubs . The diversity of the breeds is ...
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adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young