Principles of Zoölogy : Touching the Structure, Development, Distribution, and Natural Arrangement of the Races of Animals, Living and Extinct with Numerous Illustrations: Part I, Comparative Physiology, for the Use of Schools and CollegesGould and Lincoln, 1859 - 250 pagina's |
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Pagina 14
... yolk . 102. Cell - layer of the germ . 103. Separation of the cell - layer into three layers ; s , serous or nervous layer ; m , mucous or vegetative layer ; v , vascular or blood layer . 104. Embryo of a crab , showing its incipient ...
... yolk . 102. Cell - layer of the germ . 103. Separation of the cell - layer into three layers ; s , serous or nervous layer ; m , mucous or vegetative layer ; v , vascular or blood layer . 104. Embryo of a crab , showing its incipient ...
Pagina 15
... yolk ( d d ) is nearly separated from the yolk sphere , and is to become the in- testine . The heart ( h ) is already distinct , and connected by threads with the blood - layer of the body . 127. Section of the egg of a mammal ; v , the ...
... yolk ( d d ) is nearly separated from the yolk sphere , and is to become the in- testine . The heart ( h ) is already distinct , and connected by threads with the blood - layer of the body . 127. Section of the egg of a mammal ; v , the ...
Pagina 42
... yolk , while nothing similar takes place in the plant . The subsequent development of individuals is for the most part different in the two kingdoms . No limit is usually placed to the increase of plants ; trees put out new branches and ...
... yolk , while nothing similar takes place in the plant . The subsequent development of individuals is for the most part different in the two kingdoms . No limit is usually placed to the increase of plants ; trees put out new branches and ...
Pagina 67
... yolk of the egg , bearing no resemblance whatever to the future animal ; and no in- spection would enable us to declare with certainty what that animal is to be . But even here an immaterial principle is present , which no external ...
... yolk of the egg , bearing no resemblance whatever to the future animal ; and no in- spection would enable us to declare with certainty what that animal is to be . But even here an immaterial principle is present , which no external ...
Pagina 133
... yolk , ( y , ) and including other smaller cells , the germinative vesicle , ( g , ) and the germinative dot , ( d . ) The yolk itself , with its membrane , ( v , ) is formed while the egg remains in the ovary . It is afterwards ...
... yolk , ( y , ) and including other smaller cells , the germinative vesicle , ( g , ) and the germinative dot , ( d . ) The yolk itself , with its membrane , ( v , ) is formed while the egg remains in the ovary . It is afterwards ...
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Veelvoorkomende woorden en zinsdelen
albumen allantois Ammonites Animal Kingdom appear aquatic arteries Articulata Articulates auricles become belong birds blood body bones brain branches called canal carboniferous Carnivora cartilaginous cavity cells Cercaria chyle classes cloth composed contains corresponding crabs crustaceans crystalline lens cuttle-fish digestive distinct Distoma distribution divided Echinoderms eggs embryo enclosed epoch fauna fishes fluid formation fossils frog furnished Gasteropods geological germ germinative germinative vesicle gills head heart Illustrations important Infusoria insects intestine jaws jelly-fishes layer less limbs living lower lungs magnified mals mammals membrane metamorphoses mode mollusks muscles namely natural nerves nervous system oxygen peculiar period plants polyps portion Radiates regions reptiles resemblance respiration respiratory organs Rhizodonts rocks SECTION shell showing Silurian similar skin species star-fishes structure surface teeth temperate tentacles terrestrial animals Tertiary tion tissues trachea tropical types upper vegetative ventricle vertebrated animals vesicle White-fish whole worms yolk young Zoology
Populaire passages
Pagina 189 - Experiments of dredging in very deep water have also taught us that the abyss of the ocean is nearly a desert. Not only are no materials found there for sustenance, but it is doubtful if animals could sustain the pressure of so great a column of water, although many of them are provided with a system of pores, (260,) which enables them to sustain a much greater pressure than terrestrial animals. America, one species takes...