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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16 페이지
... less improved forms of life , and leads to what I have called Divergence of Character . In the next chapter I shall discuss the complex and little known laws of variation and of corre- lation of growth . In the four succeeding chapters ...
... less improved forms of life , and leads to what I have called Divergence of Character . In the next chapter I shall discuss the complex and little known laws of variation and of corre- lation of growth . In the four succeeding chapters ...
22 페이지
... less and the bones of the leg more , in proportion to the whole skeleton , than do the same bones in the wild - duck ; and I presume that this change may be safely attributed to the domestic duck flying much less , and walking more ...
... less and the bones of the leg more , in proportion to the whole skeleton , than do the same bones in the wild - duck ; and I presume that this change may be safely attributed to the domestic duck flying much less , and walking more ...
24 페이지
... less strange and commoner deviations may be freely admitted to be inheritable . Perhaps the correct way of viewing the whole subject , would be , to look at the inheritance of every character whatever as the rule , and non - inheritance ...
... less strange and commoner deviations may be freely admitted to be inheritable . Perhaps the correct way of viewing the whole subject , would be , to look at the inheritance of every character whatever as the rule , and non - inheritance ...
26 페이지
... less uniformity of character than in true species . Domestic races of the same species , also , often have a somewhat monstrous character ; by which I mean , that , although differing from each other , and from other species of the same ...
... less uniformity of character than in true species . Domestic races of the same species , also , often have a somewhat monstrous character ; by which I mean , that , although differing from each other , and from other species of the same ...
28 페이지
... less mingled , flows in the veins of our many domestic breeds . In regard to sheep and goats I can form no opinion . From facts communicated to me by Mr. Blyth , on the habits , voice , and constitution , & c . , of the humped Indian ...
... less mingled , flows in the veins of our many domestic breeds . In regard to sheep and goats I can form no opinion . From facts communicated to me by Mr. Blyth , on the habits , voice , and constitution , & c . , of the humped Indian ...
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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