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 11
... epoch of life when all are appar- ently alike , ( 275 , 276. ) Surrounding this , at the point from which each department radiates , are placed the symbols of the several departments , as explained on page 155. The zones are traversed ...
... epoch of life when all are appar- ently alike , ( 275 , 276. ) Surrounding this , at the point from which each department radiates , are placed the symbols of the several departments , as explained on page 155. The zones are traversed ...
Pagina 132
... epoch when the incipient animal is enclosed within an egg . It is then called an embryo , and the period passed in this condition is called the embryonic period . 276. Before the various classes of the animal kingdom had been ...
... epoch when the incipient animal is enclosed within an egg . It is then called an embryo , and the period passed in this condition is called the embryonic period . 276. Before the various classes of the animal kingdom had been ...
Pagina 141
... epoch , namely , a few days , and so : ne- times a few hours , after development has begun , the germ proper con- sists of a single m layer composed Fig . 102 . Fig . 103 . * In the Birds and higher reptiles we find , in the mature egg ...
... epoch , namely , a few days , and so : ne- times a few hours , after development has begun , the germ proper con- sists of a single m layer composed Fig . 102 . Fig . 103 . * In the Birds and higher reptiles we find , in the mature egg ...
Pagina 142
... epoch , to what de- partment of the animal kingdom an individual is to belong . Thus , in the Articulata , the germ is divided into segments , indicating the transverse divisions 00 Fig . 104 . Fig . 105 . of the body , as , for example ...
... epoch , to what de- partment of the animal kingdom an individual is to belong . Thus , in the Articulata , the germ is divided into segments , indicating the transverse divisions 00 Fig . 104 . Fig . 105 . of the body , as , for example ...
Pagina 146
... constantly approach Fig . 117 . 80 Fig . 118 . P m . Fig . 119 . as has been before shown , ( Fig . 107. each other until they unite and form a canal , Fig . 117 , b , ) reptiles , we find at a certain epoch , when. 146 EMBRYOLOGY .
... constantly approach Fig . 117 . 80 Fig . 118 . P m . Fig . 119 . as has been before shown , ( Fig . 107. each other until they unite and form a canal , Fig . 117 , b , ) reptiles , we find at a certain epoch , when. 146 EMBRYOLOGY .
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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...