. Human physiology : designed for colleges and the higher classes in schools, and for general reading. e dog thatyou see stands out more than either of the two representations,as seen when they are not in the instrument. The reason isobvious. In the two images formed i1 the eyes, as you lookinto the instrument, are all the lines of light and shade, which SO-i HUMAN PHYSIOLOGY. Rude imitation of the stereoscope. you would see in looking at a real dog with both eyes; whileeither one of these representations contains only a part of theselines. You can imitate in some good degree the effect of the
. Human physiology : designed for colleges and the higher classes in schools, and for general reading. e dog thatyou see stands out more than either of the two representations,as seen when they are not in the instrument. The reason isobvious. In the two images formed i1 the eyes, as you lookinto the instrument, are all the lines of light and shade, which SO-i HUMAN PHYSIOLOGY. Rude imitation of the stereoscope. you would see in looking at a real dog with both eyes; whileeither one of these representations contains only a part of theselines. You can imitate in some good degree the effect of thestereoscope, by placing the end of a small book between thesefigures, and letting the other end rest against the nose and fore-head, thus separating the eyes from each other. If now youlook intently at the two figures, you will in a few moments findthem approximate each other, till at length they mingle to-gether, and you will see but a single dog standing out like astatue. The same thing can be shown by mathematical , if two figures a a, represented in Fig. 173, be placed in FIG. the two apartments of the instrument, on looking into it youwill see a single figure, shaped like b. You can imitate thestereoscope here also, by placing the end of a book in such away as to cover the middle figure, the other end being betweenthe eyes. The two figures will run together, and the unionwill represent the figure of a truncated, four-sided figure, stand-ing out in bold relief. But such experiments afford only a rudeimitation of the stereoscope, for in this instrument the separa-tion between the eyes i9 entire, so that the effect is producedat once. There is no running together of the two figures, butthe moment that you look into the instrument they are blendedin one. 456. The harmony which we have seen to exist in the actionof the eyes is very wonderful. It must be remembered thttthe eyes are optical instruments, endowed with self-adjustingpowers, to accommodate the diffe
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