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
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America Animal Kingdom animals appear become belong birds blood body bones branches called cavity cells changes classes cloth common complete composed considerable contains corresponding covered crystalline lens deposits distinct distinguished distribution divided divisions eggs embryo epoch Europe example exist extends fauna Finally fishes formation four furnished germ gills give groups head heart higher important indicate individuals insects kind layer less limited living lower lungs mammals manner means membrane mode mollusks muscles namely natural nearly nerves observed organs passes peculiar perfect period plants Polyps portion present produce regions relation remains represented reptiles resemblance respects respiration rocks seen separated shell showing side similar single sometimes soon species striking structure successive surface temperate tion tropical types United upper varied variety various vegetation Vertebrates whole worms yolk young zone
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...