Tropical Nature, and Other EssaysMacmillan and Company, 1878 - 356 pages |
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Page xii
... Variation - Humming - Birds of Juan Fernandez as illustrating Variation and Natural Selection - The Relations and Affinities of Humming - Birds - How to Determine Doubtful Affinities -Resemblances of Swifts and Humming - Birds ...
... Variation - Humming - Birds of Juan Fernandez as illustrating Variation and Natural Selection - The Relations and Affinities of Humming - Birds - How to Determine Doubtful Affinities -Resemblances of Swifts and Humming - Birds ...
Page 2
Alfred Russel Wallace. a perpetual summer , and were it not for variations in the quantity of rain , in the direction and strength of the winds , and in the amount of sunshine , accompanied by corresponding slight changes in the ...
Alfred Russel Wallace. a perpetual summer , and were it not for variations in the quantity of rain , in the direction and strength of the winds , and in the amount of sunshine , accompanied by corresponding slight changes in the ...
Page 1
... of winter , are constantly recurring phenomena which represent to us the estab lished course of nature . At the equator none of these changes occur ; there is a perpetual equinox and ۶۰ B a perpetual summer , and were it not for variations.
... of winter , are constantly recurring phenomena which represent to us the estab lished course of nature . At the equator none of these changes occur ; there is a perpetual equinox and ۶۰ B a perpetual summer , and were it not for variations.
Page 2
Alfred Russel Wallace. a perpetual summer , and were it not for variations in the quantity of rain , in the direction and strength of the winds , and in the amount of sunshine , accompanied by corresponding slight changes in the ...
Alfred Russel Wallace. a perpetual summer , and were it not for variations in the quantity of rain , in the direction and strength of the winds , and in the amount of sunshine , accompanied by corresponding slight changes in the ...
Page 10
... variations of temperature in the temperate zone . It is this large quantity of vapour in the equatorial atmosphere that keeps up a genial warmth throughout the night by preventing the radiation into space of the heat absorbed by the ...
... variations of temperature in the temperate zone . It is this large quantity of vapour in the equatorial atmosphere that keeps up a genial warmth throughout the night by preventing the radiation into space of the heat absorbed by the ...
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abundant adapted adorned Africa allied Amazon animals ants Asia attract bamboo Batavia beautiful become birds blue brilliant butterflies carnivora causes changes character characteristic climate colour Colours of Animals comparatively conspicuous continent curious Danaid¿ Darwin distinct Eocene equator equatorial zone existence extensive fact families fauna favourable feet female ferns fertilization flowers foliage forests fruits genera genus greater green groups habits heat humming-birds hy¿nas immense inhabit insects Juan Fernandez land larger larv¿ leaves lemurs less light Madagascar Malay Archipelago male mammalia marsupials Miocene monkeys natural selection naturalists North northern observed occur ocean ornaments Palearctic parrots peculiar perhaps phenomena plants plumage probably produced proportion protection rays region remarkable resemble sexual selection showy slender sometimes South America species spots structure sun-birds surface tail temperate zones temperature theory tints tion trees tropical trunks Ungulata variation varied variety vegetation whole wings yellow