On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for Life |
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Page 9
... structure not necessarily simultaneous - Difficulties on the theory of the Natural Selection of instincts - Neuter or sterile insects- Summary 189 CHAPTER VIII HYBRIDISM Distinction between the sterility of first crosses and of hybrids ...
... structure not necessarily simultaneous - Difficulties on the theory of the Natural Selection of instincts - Neuter or sterile insects- Summary 189 CHAPTER VIII HYBRIDISM Distinction between the sterility of first crosses and of hybrids ...
Page 14
... structure and coadaptation which justly excites our admiration . Naturalists continually refer to external conditions , such as climate , food , & c . , as the only possible cause of variation . In one very limited sense , as we 14 ...
... structure and coadaptation which justly excites our admiration . Naturalists continually refer to external conditions , such as climate , food , & c . , as the only possible cause of variation . In one very limited sense , as we 14 ...
Page 15
... structure , for instance , of the woodpecker , with its feet , tail , beak , and tongue , so admirably adapted to catch insects under the bark of trees . In the case of the mistletoe , which draws its nourishment from certain trees ...
... structure , for instance , of the woodpecker , with its feet , tail , beak , and tongue , so admirably adapted to catch insects under the bark of trees . In the case of the mistletoe , which draws its nourishment from certain trees ...
Page 22
... structure . [ Nevertheless some slight amount of change may , I think , be attributed to the direct action of the conditions of life - as , in some cases , increased size from amount of food , colour from particular kinds of food , and ...
... structure . [ Nevertheless some slight amount of change may , I think , be attributed to the direct action of the conditions of life - as , in some cases , increased size from amount of food , colour from particular kinds of food , and ...
Page 23
... structure , owing to the mysterious laws of the correlation of growth . ] The result of the various , quite unknown , or dimly seen laws of variation is infinitely complex and diversified . It is well worth while carefully to study the ...
... structure , owing to the mysterious laws of the correlation of growth . ] The result of the various , quite unknown , or dimly seen laws of variation is infinitely complex and diversified . It is well worth while carefully to study the ...
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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