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
... 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.
... 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.
11 페이지
... modification - Classification of varieties - Descent always used in classification - Analogical or adaptive characters Affinities , general , complex and radiating Extinction separates and defines groups - MORPHOLOGY , between members ...
... modification - Classification of varieties - Descent always used in classification - Analogical or adaptive characters Affinities , general , complex and radiating Extinction separates and defines groups - MORPHOLOGY , between members ...
15 페이지
... modification and CO- adaptation . At the commencement of my observations it seemed to me probable that a careful study of domes- ticated animals and of cultivated plants would offer the best chance of making out this obscure problem ...
... modification and CO- adaptation . At the commencement of my observations it seemed to me probable that a careful study of domes- ticated animals and of cultivated plants would offer the best chance of making out this obscure problem ...
16 페이지
... these relations are of the highest importance , for they determine the present welfare , and , as I believe , the future success and modification of every inhabitant of this world . Still less do we know of 16 INTRODUCTION CHAPTER I.
... these relations are of the highest importance , for they determine the present welfare , and , as I believe , the future success and modification of every inhabitant of this world . Still less do we know of 16 INTRODUCTION CHAPTER I.
81 페이지
... modifying and improving some of the varying inhabitants For as all the inhabitants of each country are struggling together struggling together with nicely balanced forces extremely slight modifications in the structure or habits of one ...
... modifying and improving some of the varying inhabitants For as all the inhabitants of each country are struggling together struggling together with nicely balanced forces extremely slight modifications in the structure or habits of one ...
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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