Abstract
THE researches of Crookes, Lenard, and Röntgen have given to man a new eye; they have, perhaps, also given to nature a new light; they have certainly given to science more than one new problem. A vacuum tube may appear but a simple piece of apparatus; but were we acquainted in their entirety with the secrets that it contains, we should know much at present utterly unknown, not only as regards electrical action, but also in reference,to the fundamental constitution of matter, and the true mechanism of energy. It is, in fact, for the reason that within the Crookes radiant matter tube it is possible to deal, not as in every day life with aggregates of matter, but perhaps individually with single molecules and single atoms floating apart in spaces, thatt so much attention is at present being devoted to this particular branch of physics.
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