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
... CHAPTER VI DIFFICULTIES ON THEORY Difficulties on the theory of descent with modification - Transitions— Absence or rarity of transitional varieties - Transitions in habits of life - Diversified habits in the same species - 8 CONTENTS.
... CHAPTER VI DIFFICULTIES ON THEORY Difficulties on the theory of descent with modification - Transitions— Absence or rarity of transitional varieties - Transitions in habits of life - Diversified habits in the same species - 8 CONTENTS.
9 페이지
... habits in the same species - Species with habits widely different from those of their allies - Organs of extreme perfection - Means of transition - Cases of difficulty— Natura non facit saltum - Organs of small importance - Organs not ...
... habits in the same species - Species with habits widely different from those of their allies - Organs of extreme perfection - Means of transition - Cases of difficulty— Natura non facit saltum - Organs of small importance - Organs not ...
28 페이지
... habits , voice , and constitution , & c . , of the humped Indian cattle , it is probable that these descended from a different aboriginal stock from our European cattle ; and several competent judges believe that these latter have had ...
... habits , voice , and constitution , & c . , of the humped Indian cattle , it is probable that these descended from a different aboriginal stock from our European cattle ; and several competent judges believe that these latter have had ...
32 페이지
... habits with the domestic breeds , has not been exterminated even on several of the smaller British islets , or on the shores of the Mediterranean . Hence the supposed ex- termination of so many species having similar habits with the ...
... habits with the domestic breeds , has not been exterminated even on several of the smaller British islets , or on the shores of the Mediterranean . Hence the supposed ex- termination of so many species having similar habits with the ...
33 페이지
... habits , voice , colouring , and in most parts of their structure , with the wild rock - pigeon , yet are certainly highly abnormal in other parts of their structure ; we may look in vain throughout the whole great family of Columbidæ ...
... habits , voice , colouring , and in most parts of their structure , with the wild rock - pigeon , yet are certainly highly abnormal in other parts of their structure ; we may look in vain throughout the whole great family of Columbidæ ...
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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