Darwinism: An Exposition of the Theory of Natural Selection, with Some of Its ApplicationsMacmillan, 1891 - Всего страниц: 494 |
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Стр. 4
... the theory of progressive development , " and he explains the fact that there are so often distinct species in countries of similar climate and vegetation by " " " special creations in each country ; and 4 CHAP . DARWINISM.
... the theory of progressive development , " and he explains the fact that there are so often distinct species in countries of similar climate and vegetation by " " " special creations in each country ; and 4 CHAP . DARWINISM.
Стр. 15
... vegetation . On the other hand , of the many hundreds of hardy plants which produce seed freely in our gardens , very few ever run wild , and hardly any have become common . Even attempts to naturalise suitable plants usually fail ; for ...
... vegetation . On the other hand , of the many hundreds of hardy plants which produce seed freely in our gardens , very few ever run wild , and hardly any have become common . Even attempts to naturalise suitable plants usually fail ; for ...
Стр. 17
... vegetation than the goat , and Mr. Marsh believes that forests would soon cover considerable tracts of the Arabian and African deserts if the goat and the camel were removed from them.1 Even in many parts of our own country the ...
... vegetation than the goat , and Mr. Marsh believes that forests would soon cover considerable tracts of the Arabian and African deserts if the goat and the camel were removed from them.1 Even in many parts of our own country the ...
Стр. 18
... vegetation of a given district can only support a certain number of animals , and the different kinds of plant - eaters will compete together for it . They will also have insects for their competitors , and these insects will be kept ...
... vegetation of a given district can only support a certain number of animals , and the different kinds of plant - eaters will compete together for it . They will also have insects for their competitors , and these insects will be kept ...
Стр. 19
... vegetation : this again would largely affect the insects , and this , as we have just seen in Staffordshire , the insectivorous birds , and so onward in ever- increasing circles of complexity . Not that under nature the relations will ...
... vegetation : this again would largely affect the insects , and this , as we have just seen in Staffordshire , the insectivorous birds , and so onward in ever- increasing circles of complexity . Not that under nature the relations will ...
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abundant adapted adduced allied species America amount animals and plants appears birds breed brilliant butterflies carnivora cause characters climate closely allied colours of animals common conspicuous continued cross-fertilisation crossed curious Darwin dicotyledons distinct species domestic animals effects eggs enemies Eocene evidence extinct facts faculty favourable female fertile fertilised flowers genera genus geological groups habits hybrids illustration important increase individuals infertility inhabit insects intercrossing kind larvæ less living male mammalia mammals markings marsupials mimicry Miocene mode modified moths natural selection naturalists nests occur offspring organs Origin of Species peculiar pigeons Pliocene pollen portion possess probably produced Professor protectively coloured pupa races regions remarkable resemble seeds self-fertilisation Silurian similar South America specimens spots sterility structure struggle for existence supposed tail theory tints tion toes trees tropical usually variability variation varied varieties vegetation warning colours whole wild wings