Darwinism: An Exposition of the Theory of Natural Selection, with Some of Its ApplicationsMacmillan and Company, 1889 - 494 páginas |
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Página 25
... pupa state about five or six days , so that each parent fly may be increased ten thousand - fold in a fortnight . Supposing they went on increasing at this rate during only three months of summer , there would result one hundred ...
... pupa state about five or six days , so that each parent fly may be increased ten thousand - fold in a fortnight . Supposing they went on increasing at this rate during only three months of summer , there would result one hundred ...
Página 113
... pupa state , during which period a brown instead of a green colour is protective . Others have acquired curious attitudes and large ocelli , which cause them to resemble the head of some reptile , or they have curious horns or coloured ...
... pupa state , during which period a brown instead of a green colour is protective . Others have acquired curious attitudes and large ocelli , which cause them to resemble the head of some reptile , or they have curious horns or coloured ...
Página 118
... pupa state in accordance with its surroundings . The pupae of caddis - flies inhabiting streams have fringes of hair on the tarsi to enable them to reach the surface on leaving their cases . But in the species inhabiting bromelia leaves ...
... pupa state in accordance with its surroundings . The pupae of caddis - flies inhabiting streams have fringes of hair on the tarsi to enable them to reach the surface on leaving their cases . But in the species inhabiting bromelia leaves ...
Página 195
... pupa form . The most striking example of the first class is that of the chameleon , which changes to white , brown , yellowish , or green , according to the colour of the object on which it rests . This change is brought about by means ...
... pupa form . The most striking example of the first class is that of the chameleon , which changes to white , brown , yellowish , or green , according to the colour of the object on which it rests . This change is brought about by means ...
Página 196
... pupa , which undergo changes of colour when exposed to differently coloured surroundings . This subject has been carefully investigated by Mr. E. B. Poulton , who has communicated the results of his experiments to the Royal Society.1 It ...
... pupa , which undergo changes of colour when exposed to differently coloured surroundings . This subject has been carefully investigated by Mr. E. B. Poulton , who has communicated the results of his experiments to the Royal Society.1 It ...
Outras edições - Ver tudo
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