The Science of Life, Volumen 4Cassell, 1931 - 896 páginas |
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Página 609
... Freedom of intercourse and communication stimulates both trade and thought ; but it gives disease - germs new facilities for rapid spreading , as when the opening up of Africa brought sleeping sickness across from the West Coast to the ...
... Freedom of intercourse and communication stimulates both trade and thought ; but it gives disease - germs new facilities for rapid spreading , as when the opening up of Africa brought sleeping sickness across from the West Coast to the ...
Página 621
... freedom of savage races from disease . What one sees among savages is not the vigour of prolonged life but the brief precarious vigour of youth ; the ailing have already been removed from the sample . Our flint - chipping ancestors were ...
... freedom of savage races from disease . What one sees among savages is not the vigour of prolonged life but the brief precarious vigour of youth ; the ailing have already been removed from the sample . Our flint - chipping ancestors were ...
Página 872
... freedom , hinders the development of a sane conservation and exploitation of the economic resources of the world , and is altogether so patently evil that it is impossible to believe that it will maintain itself for many more ...
... freedom , hinders the development of a sane conservation and exploitation of the economic resources of the world , and is altogether so patently evil that it is impossible to believe that it will maintain itself for many more ...
Índice
THE RANGE NATURE AND STUDY OF LIVING THINGS | 3 |
66 | 5 |
muscles and related | 8 |
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Términos y frases comunes
active algæ animals arthropods bacteria become birds blood body bones brain branches called capillaries carbon carbon dioxide cells Cenozoic changes chemical chromosomes colour creatures crustaceans digestive Echinoderms eggs elaborate embryo Eocene Everyman evolution example eyes fact female fertilized fish flatworms flowers fluid forms fossils gametes genes germ-plasm glands grow growth heart human Ichthyosaurs important individual insects intestine kidneys kinds land larvæ layer less limbs liver living things lobster lungs male mammals marsupials matter means ment microscopic million molluscs mouse mouth movements muscles mutations nervous system normal notochord Obelia organs ovary ovum oxygen pair parasitic phylum plants polyps produced proteins prothallus protozoa reproduction reptiles round secretion sense-organs sexual shell skeleton skin species spermatozoa sperms spores stage starfish stomach structure substances surface swim tail teeth thyroid tiny tion tissue to-day tube types variations various vertebrates whole worms