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 12
... crystalline lens ; f , cornea ; g , iris ; h , vitreous body ; i , chamber , divided by the iris . 14. Diagram , showing the effect of the eye on rays of light . 15. Position of the eye of the snail . 16. Eyes ( ocelli ) of the spider ...
... crystalline lens ; f , cornea ; g , iris ; h , vitreous body ; i , chamber , divided by the iris . 14. Diagram , showing the effect of the eye on rays of light . 15. Position of the eye of the snail . 16. Eyes ( ocelli ) of the spider ...
Pagina 49
... crystalline lens , ( e . ) It is tolerably firm , perfectly transparent , and composed of layers of unequal density , the interior being always more compact than the exterior . Its form varies in different classes of animals . In ...
... crystalline lens , ( e . ) It is tolerably firm , perfectly transparent , and composed of layers of unequal density , the interior being always more compact than the exterior . Its form varies in different classes of animals . In ...
Pagina 50
... crystalline lens C D , and the vitreous humor , so that the two rays , m i and n f , will at last meet in a point . This point is called the focus , ( c , ) and in distinct vision is always precisely at the retina , E F. 78. From this ...
... crystalline lens C D , and the vitreous humor , so that the two rays , m i and n f , will at last meet in a point . This point is called the focus , ( c , ) and in distinct vision is always precisely at the retina , E F. 78. From this ...
Pagina 51
... crystalline lens and the vitreous humor combined , are represented by the magnifying lens . But there is this important difference , that the eye has the power of changing its form , and of adapt- ing itself so as to discern with equal ...
... crystalline lens and the vitreous humor combined , are represented by the magnifying lens . But there is this important difference , that the eye has the power of changing its form , and of adapt- ing itself so as to discern with equal ...
Pagina 52
... crystalline lens , and more or less distinct traces of the vitreous body . Some bivalve mollusks , the scollops for example , have likewise a crystalline lens , but instead of two eyes , they are furnished with numerous eye - spots ...
... crystalline lens , and more or less distinct traces of the vitreous body . Some bivalve mollusks , the scollops for example , have likewise a crystalline lens , but instead of two eyes , they are furnished with numerous eye - spots ...
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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...