The Science of Life, Volumen 4Cassell, 1931 - 896 páginas |
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Página 33
... side by side would measure about an inch . It has no nucleus . Inside the cell there is an appar- ently homogeneous fluid in which no structural elements can be discerned , con- taining as one of its chemical constituents a red pigment ...
... side by side would measure about an inch . It has no nucleus . Inside the cell there is an appar- ently homogeneous fluid in which no structural elements can be discerned , con- taining as one of its chemical constituents a red pigment ...
Página 205
... side toes much reduced relative to the middle toe , on which the hoof is forming . ( C ) The same in a five - months embryo , showing side toes reduced to splints . ( D ) The end of a side toe of ( C ) , much enlarged , showing its ...
... side toes much reduced relative to the middle toe , on which the hoof is forming . ( C ) The same in a five - months embryo , showing side toes reduced to splints . ( D ) The end of a side toe of ( C ) , much enlarged , showing its ...
Página 409
... side - to - side undu- lation of the whole body , like a fish , or a lamprey , or a lancelet . It is by far the swiftest and strongest method of progression that aquatic life has discovered . Its effects are written throughout the ...
... side - to - side undu- lation of the whole body , like a fish , or a lamprey , or a lancelet . It is by far the swiftest and strongest method of progression that aquatic life has discovered . Its effects are written throughout the ...
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