Page:Popular Science Monthly Volume 13.djvu/178

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166
THE POPULAR SCIENCE MONTHLY.

The connections thus traced, parallel to connections already traced, are at once seen to be natural on remembering that militant activities, intrinsically coercive, neccessitate command and obedience, and that therefore, where they predominate, signs of submission are insisted upon; while, conversely, industrial activities, whether exemplified in the relations of employer and employed or of buyer and seller, being carried on under agreement, are intrinsically non-coercive, and there-fore, where they predominate, only fulfillment of contract is insisted upon: whence results decreasing use of the signs of submission.

 
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WATER-WAVES AND SOUND-WAVES.[1]
By J. NORMAN LOCKYER, F. R. S.

LET us find a piece of tranquil water and drop a stone into it. What happens?—a most beautiful thing, full of the most precious teachings. The place where the stone fell in is immediately surrounded by what we all recognize as a wave of water traveling outward and

PSM V13 D178 Superposition of two wave systems.jpg
Fig. 1.—Superposition of Two Wave-Systems.

then another is generated, and then another, until at length an exquisite series of concentric waves is seen, all apparently traveling outward

  1. From advance sheets of "Studies in Spectrum Analysis" ("International Scientific Series," No. XXIII.).