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The laws governing propagation of very short waves are the same as those governing the propagation of luminous vibrations. However, because of the difference in frequencies, the absorption, due in large measure to diffusion by particles suspended in air, is less for very short waves than for light, which explains the very great distance traveled by these waves. Communications have been carried on by very short waves between points not in direct line of vision. The phenomena of atmospheric refraction may explain this result, and the hypothesis seems to be justified by certain observations.