. The animans and man; an elementary textbook of zoology and human physiology. ears fi ^o* FIG. 29. The antenna ofa carrion beetle, withthe terminal three seg-ments enlarged and flat- b r a t C S .tened and bearing manysmelling-pits. (Muchenlarged; photo-micro-graph by Geo. O. Mitch- which are e11-) adapted for perceiving or being stimu-lated by vibrations ranging from1 6 to 40,000 a second — that is,for hearing all those sounds pro-duced by vibrations of a rapiditynot less than 16 to a second nor. FIG. 30. Diagram of the in-ternal part of the human ear;0, external opening; b, bonesof the ear;

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. The animans and man; an elementary textbook of zoology and human physiology. ears fi ^o* FIG. 29. The antenna ofa carrion beetle, withthe terminal three seg-ments enlarged and flat- b r a t C S .tened and bearing manysmelling-pits. (Muchenlarged; photo-micro-graph by Geo. O. Mitch- which are e11-) adapted for perceiving or being stimu-lated by vibrations ranging from1 6 to 40,000 a second — that is,for hearing all those sounds pro-duced by vibrations of a rapiditynot less than 16 to a second nor. FIG. 30. Diagram of the in-ternal part of the human ear;0, external opening; b, bonesof the ear; /, labyrinth; c,cochlea or snail shell; n, auditory nerve. (After Head-greater than 40,000 to a second iy.) ANIMAL PHYSIOLOGY 73 -are of such complexity of structure that many pageswould be required for their description. But among thelower or less highly organized animals the ears, or audi-tory organs, are much simpler. In most animals the auditory organs show the commoncharacteristic of being wholly composed of, or having,

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Keywords: ., bookcentury1900, bookd, booksubjectphysiology, booksubjectzoology