he wires of the circuit. The cell contain- Can science go farther back still? Itis the tendency of the ing the solution of iodine being then placed. at A, a momen- human mind to analyse backwards, and to enquire whence tary exposure of the face of the pile at the non-visible focus thing's have… … cerned, seemed as far off as ever, for next the nozzle of the that light is propagated by waves. “Before such an idea stedm jet was aclear transparent space between it and the could have taken any real root in the human mind, it must It was therefore proved that the heat rays have passed cloud.…
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