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
... 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 - Summary 129 CHAPTER VI ...
... 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 - Summary 129 CHAPTER VI ...
16 페이지
... manner profitable to itself , under the complex and sometimes varying conditions of life , will have a better chance of surviving , and thus be naturally selected . From the strong principle of inheritance , any selected variety will ...
... manner profitable to itself , under the complex and sometimes varying conditions of life , will have a better chance of surviving , and thus be naturally selected . From the strong principle of inheritance , any selected variety will ...
21 페이지
... manner . To judge how much , in the case of any variation , we should attribute to the direct action of heat , moisture , light , food , & c . , is most difficult ; my impression is , that with animals such agencies have produced very ...
... manner . To judge how much , in the case of any variation , we should attribute to the direct action of heat , moisture , light , food , & c . , is most difficult ; my impression is , that with animals such agencies have produced very ...
24 페이지
... primary cause , which may have acted on the ovules or on the male element ; in nearly the same manner as in the offspring from a short - horned * cow by a long - horned bull , the greater 24 VARIATION UNDER DOMESTICATION.
... primary cause , which may have acted on the ovules or on the male element ; in nearly the same manner as in the offspring from a short - horned * cow by a long - horned bull , the greater 24 VARIATION UNDER DOMESTICATION.
26 페이지
... manner as , only in most cases in a lesser degree than , do closely - allied species of the same genus in a state of nature . I think that this must be admitted , when we find that there are hardly any domestic races , either amongst ...
... manner as , only in most cases in a lesser degree than , do closely - allied species of the same genus in a state of nature . I think that this must be admitted , when we find that there are hardly any domestic races , either amongst ...
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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