Fie. I..r-APPAEATII8 FOE DISTIPTGUISHINe THE EFFECTS OF THE BAYS OF THE SOLAE 8PE0TEUM. Fig. 8.—Apparatus for distinguishing the effects of variously colored rays.A smooth, nearly flat, water-worn stone, a little largerthan the fist, was selected from the bed of the stream whichran through the…
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