Darwinism: An Exposition of the Theory of Natural Selection, with Some of Its ApplicationsMacmillan, 1891 - Всего страниц: 494 |
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Стр. 7
... adduce such difficulties as the first development of the eye , or of the milk - producing glands of the mammalia ; the wonderful instincts of bees and of ants ; the complex arrangements for the fertilisation of orchids , and numerous ...
... adduce such difficulties as the first development of the eye , or of the milk - producing glands of the mammalia ; the wonderful instincts of bees and of ants ; the complex arrangements for the fertilisation of orchids , and numerous ...
Стр. 10
... adduced are so novel and so curious that they are sure to be appreciated by every one who takes an interest in nature , but unless the need of them is clearly seen it may be thought that time is being wasted on mere curious details and ...
... adduced are so novel and so curious that they are sure to be appreciated by every one who takes an interest in nature , but unless the need of them is clearly seen it may be thought that time is being wasted on mere curious details and ...
Стр. 20
... adduced by Mr. Darwin , and often quoted for its striking and almost eccentric character . It is now well known that many flowers require to be fertilised by insects in order to produce seed , and this fertilisation can , in some cases ...
... adduced by Mr. Darwin , and often quoted for its striking and almost eccentric character . It is now well known that many flowers require to be fertilised by insects in order to produce seed , and this fertilisation can , in some cases ...
Стр. 25
... adduced , sufficiently prove that there is a continual competition , and struggle , and war going on in nature , and that each species of animal and plant affects many others in complex and often unexpected ways . We will now proceed to ...
... adduced , sufficiently prove that there is a continual competition , and struggle , and war going on in nature , and that each species of animal and plant affects many others in complex and often unexpected ways . We will now proceed to ...
Стр. 27
... adduced . That even the larger animals , which breed comparatively slowly , increase enormously when placed under favourable conditions in new countries , is shown by the rapid spread of cattle and horses in America . Columbus , in his ...
... adduced . That even the larger animals , which breed comparatively slowly , increase enormously when placed under favourable conditions in new countries , is shown by the rapid spread of cattle and horses in America . Columbus , in his ...
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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