Darwinism: An Exposition of the Theory of Natural Selection, with Some of Its ApplicationsMacmillan and Company, 1889 - 494 páginas |
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Página 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 of ...
... 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 of ...
Página 44
... 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.
... 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.
Página 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 ...
Página 48
... Hind Legs Tail Length of Head taken as the FIG . 2. - Variation of Lizards . each specimen are then laid down in the same manner. standard in each of the above - named species FIG . 4. - Dolichonyx oryzivorus . 20 Males . 48 CHAP .
... Hind Legs Tail Length of Head taken as the FIG . 2. - Variation of Lizards . each specimen are then laid down in the same manner. standard in each of the above - named species FIG . 4. - Dolichonyx oryzivorus . 20 Males . 48 CHAP .
Página 55
... in . Tarsus , 1.65in Middle Toe , 1.14in Outer Toe . 0.81in , Hind Toe . 0.90in 15 20 15 20 5 10 1 ! LO 5 10 15 20 25 30 35. FIG . 4. - Dolichonyx oryzivorus . 20 Males . FIG . 5. - Agelæus phoeniceus , FIG . 6. III 55 DIAGRAM OF VARIATION.
... in . Tarsus , 1.65in Middle Toe , 1.14in Outer Toe . 0.81in , Hind Toe . 0.90in 15 20 15 20 5 10 1 ! LO 5 10 15 20 25 30 35. FIG . 4. - Dolichonyx oryzivorus . 20 Males . FIG . 5. - Agelæus phoeniceus , FIG . 6. III 55 DIAGRAM OF VARIATION.
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Darwinism: An Exposition of the Theory of Natural Selection, with Some of ... Alfred Russel Wallace Visualização integral - 1890 |
Darwinism: An Exposition of the Theory of Natural Selection, with Some of ... Alfred Russel Wallace Visualização integral - 1890 |
Darwinism: An Exposition of the Theory of Natural Selection ..., Volumes 1-2 Alfred Russel Wallace Visualização integral - 1889 |
Palavras e frases frequentes
abundant adapted adduced allied species America amount animals and plants appears birds breed brilliant butterflies cause characters climate closely allied colours of animals common concealment 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 important increase individuals infertility inhabit insects intercrossing kind larva 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 regions remarkable resemblance seeds self-fertilisation Silurian similar 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 Zealand