Darwinism: An Exposition of the Theory of Natural Selection, with Some of Its ApplicationsMacmillan, 1891 - Всего страниц: 494 |
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Стр. xii
... males— Sexual characters due to natural selection -- Decorative plumage of males and its effect on the females - Display of decorative plumage by the males - A theory of animal coloration - The origin of accessory plumes - Development ...
... males— Sexual characters due to natural selection -- Decorative plumage of males and its effect on the females - Display of decorative plumage by the males - A theory of animal coloration - The origin of accessory plumes - Development ...
Стр. 44
... in the shape of the wings , especially in the male sex . " Again , at St. Paulo , Ithomia 1 United States Geological Survey of the Territories , 1874 . Orolina exhibits four distinct varieties , all occurring together , 44 CHAP . DARWINISM.
... in the shape of the wings , especially in the male sex . " Again , at St. Paulo , Ithomia 1 United States Geological Survey of the Territories , 1874 . Orolina exhibits four distinct varieties , all occurring together , 44 CHAP . DARWINISM.
Стр. 45
... male , while another is much larger and has " the hind wings in the male different in shape . " Of Heliconius Numata Mr. Bates says : " This species is so variable that it is difficult to find two examples exactly alike , " while " it ...
... male , while another is much larger and has " the hind wings in the male different in shape . " Of Heliconius Numata Mr. Bates says : " This species is so variable that it is difficult to find two examples exactly alike , " while " it ...
Стр. 54
... male adult specimens . These characters are the lengths of the body , wing , tail , tarsus , middle toe , outer toe , and hind toe , being as many as can be conveniently exhibited in one diagram . The length of the body is not given by ...
... male adult specimens . These characters are the lengths of the body , wing , tail , tarsus , middle toe , outer toe , and hind toe , being as many as can be conveniently exhibited in one diagram . The length of the body is not given by ...
Стр. 55
... , 1.65in Middle Toe . 1.14in Outer Toe . 0.81in Hind Toe . 0.90in 15 20 15 20 10 ما 5 10 15 20 25 30 35 40 5. FIG . 4. - Dolichonyx oryzivorus . 20 Males . FIG . 5. - Agelæus phoeniceus . FIG . 6. III 55 DIAGRAM OF VARIATION 55.
... , 1.65in Middle Toe . 1.14in Outer Toe . 0.81in Hind Toe . 0.90in 15 20 15 20 10 ما 5 10 15 20 25 30 35 40 5. FIG . 4. - Dolichonyx oryzivorus . 20 Males . FIG . 5. - Agelæus phoeniceus . FIG . 6. III 55 DIAGRAM OF VARIATION 55.
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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