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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13 페이지
... America , and in the geological relations of the present to the past inhabitants of that continent . These facts , as will be seen in the latter chapters of this volume , seemed to throw some light on the origin of species - that ...
... America , and in the geological relations of the present to the past inhabitants of that continent . These facts , as will be seen in the latter chapters of this volume , seemed to throw some light on the origin of species - that ...
53 페이지
... America and Europe , which differ very slightly from each other , have been ranked by one eminent naturalist as undoubted species , and by another as varieties , or , as they are often called , as geographical races ! Many years ago ...
... America and Europe , which differ very slightly from each other , have been ranked by one eminent naturalist as undoubted species , and by another as varieties , or , as they are often called , as geographical races ! Many years ago ...
66 페이지
... America , and latterly in Australia , had not been well authenticated , they would have been incredible . So it is with plants : cases could be given of introduced plants which have become common throughout whole islands in a period of ...
... America , and latterly in Australia , had not been well authenticated , they would have been incredible . So it is with plants : cases could be given of introduced plants which have become common throughout whole islands in a period of ...
67 페이지
... America since its discovery . In such cases , and endless instances could be given , no one supposes that the fertility of these animals or plants has been suddenly and temporarily increased in any sensible degree . The obvious ...
... America since its discovery . In such cases , and endless instances could be given , no one supposes that the fertility of these animals or plants has been suddenly and temporarily increased in any sensible degree . The obvious ...
68 페이지
... America . Here I will make only a few remarks , just to recall to the reader's mind some of the chief points . Eggs or very young animals seem generally to suffer most , but this is not invariably the case . With plants there is a vast ...
... America . Here I will make only a few remarks , just to recall to the reader's mind some of the chief points . Eggs or very young animals seem generally to suffer most , but this is not invariably the case . With plants there is a vast ...
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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