On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430페이지 |
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8 페이지
... considered - Indefinite multiplication of species - Summary .. 78 CHAPTER V LAWS OF VARIATION Effects of external conditions - Use and disuse , combined with natural selection ; organs of flight and of vision - Acclimatisa- tion ...
... considered - Indefinite multiplication of species - Summary .. 78 CHAPTER V LAWS OF VARIATION Effects of external conditions - Use and disuse , combined with natural selection ; organs of flight and of vision - Acclimatisa- tion ...
14 페이지
... considering the Origin of Species , it is quite con- ceivable that a naturalist , reflecting on the mutual affinities of organic beings , on their embryological rela- tions , their geographical distribution , geological succes- sion ...
... considering the Origin of Species , it is quite con- ceivable that a naturalist , reflecting on the mutual affinities of organic beings , on their embryological rela- tions , their geographical distribution , geological succes- sion ...
32 페이지
... considering their size , habits , and remarkable characters , seems very improbable ; or they must have become extinct in the wild state . But birds breeding on preci- pices , and good fliers , are unlikely to be exterminated ; and the ...
... considering their size , habits , and remarkable characters , seems very improbable ; or they must have become extinct in the wild state . But birds breeding on preci- pices , and good fliers , are unlikely to be exterminated ; and the ...
42 페이지
... considered as un- consciously followed , in so far that the breeders could never have expected or even have wished to produce the result which , ensued - namely , the production of two distinct strains . ] The two flocks of Leicester ...
... considered as un- consciously followed , in so far that the breeders could never have expected or even have wished to produce the result which , ensued - namely , the production of two distinct strains . ] The two flocks of Leicester ...
52 페이지
... good species , and by another as mere varieties . Mr. H. C. Watson , to whom I lie under deep obligation for assistance of all kinds , has marked for me 182 British plants , which are generally considered 52 VARIATION UNDER NATURE.
... good species , and by another as mere varieties . Mr. H. C. Watson , to whom I lie under deep obligation for assistance of all kinds , has marked for me 182 British plants , which are generally considered 52 VARIATION UNDER NATURE.
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accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely