Principles of Zo÷logy : 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 Colleges

Gould and Lincoln, 1859 - 250 pagina's
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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...

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