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 43
... soon becomes so vitiated by respiration , as to be unfit to sustain life ; but if living plants are enclosed with the animal at the same time , the air is maintained pure , and no difficulty is experienced . The practical effect of this ...
... soon becomes so vitiated by respiration , as to be unfit to sustain life ; but if living plants are enclosed with the animal at the same time , the air is maintained pure , and no difficulty is experienced . The practical effect of this ...
Pagina 51
... soon after the death of the animal , and arrange it in one end of a tube , so that the cornea will face outwards ; then if we look in at the other end of the tube , we may see objects to which it is directed exactly pictured upon the ...
... soon after the death of the animal , and arrange it in one end of a tube , so that the cornea will face outwards ; then if we look in at the other end of the tube , we may see objects to which it is directed exactly pictured upon the ...
Pagina 92
... But as this support very soon yields , owing to the slight density of the air , it follows that the bird must make the greater and more raj id efforts to compensate for this disadvantage . Hence 360 92 MODES OF PROGRESSION .
... But as this support very soon yields , owing to the slight density of the air , it follows that the bird must make the greater and more raj id efforts to compensate for this disadvantage . Hence 360 92 MODES OF PROGRESSION .
Pagina 116
... soon as respiration commences . 242. In reptiles , ( Fig . 86 , ) the venous blood from the body is received into one auricle , and the oxygenated blood from the lungs into the other . These throw their contents into the single ...
... soon as respiration commences . 242. In reptiles , ( Fig . 86 , ) the venous blood from the body is received into one auricle , and the oxygenated blood from the lungs into the other . These throw their contents into the single ...
Pagina 127
... soon destroying life . These atter are usually termed EXCRETIONS . 265. As the weight of the body , except during its period of active growth , remains nearly uniform , it follows that it must daily lose as much as it receives ; in ...
... soon destroying life . These atter are usually termed EXCRETIONS . 265. As the weight of the body , except during its period of active growth , remains nearly uniform , it follows that it must daily lose as much as it receives ; in ...
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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...