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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10 페이지
... follow the same general rules in their appear- ance and disappearance as do single species - On Extinction- On simultaneous changes in the forms of life throughout the world - On the affinities of extinct species to each other and to ...
... follow the same general rules in their appear- ance and disappearance as do single species - On Extinction- On simultaneous changes in the forms of life throughout the world - On the affinities of extinct species to each other and to ...
15 페이지
... follows from the high geometrical ratio of their increase , will be treated of . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are INTRODUCTION 15.
... follows from the high geometrical ratio of their increase , will be treated of . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are INTRODUCTION 15.
16 페이지
... follows that any being , if it vary however slightly in any 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 ...
... follows that any being , if it vary however slightly in any 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 ...
38 페이지
... follow it as a trade the sheep are placed on a table and are studied , like a picture by a connoisseur ; this is done three times at intervals of months , and the sheep are each time marked and classed , so that the very best may ...
... follow it as a trade the sheep are placed on a table and are studied , like a picture by a connoisseur ; this is done three times at intervals of months , and the sheep are each time marked and classed , so that the very best may ...
52 페이지
... follow . We must , however , in many cases , decide by a majority of naturalists , for few well - marked and well - known varieties can be named which have not been ranked as species by at least some competent judges . That varieties of ...
... follow . We must , however , in many cases , decide by a majority of naturalists , for few well - marked and well - known varieties can be named which have not been ranked as species by at least some competent judges . That varieties of ...
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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