t and a sensitive plate behind; only, instead of being ist on the retina. This is the phenomenon known among coated with collodion, the sensitive part is a hollow sphere, physicists by the name of persistence of vision. To illus- covered with a delicate network of nerve structure, called trate this… … Fig. 2 shows the layers of the human retina magnified 400 Similarly red and green disks of light, thrown on the times. There are -no less than ten of them, all of which, screen, produce the compound impression we call yellow chromatrope is an instrument for effecting this. It consists with the…
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