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But permit the same two gases to unite chemically; then, without any augmentation of the quantity of matter, without altering the gaseous condition, without interfering in any way with the transparency of the gas, the act of chemical union is accompanied by an enormous diminution of its diathermancy, or perviousness to radiant heat.

We are to have the apparatus, which illustrates the conversion of radiant energy into sonorous vibrations. Have you ever heard, my dear, of the Diathermancy of Ebonite? Not in your way, perhaps?" Carmina looked as unintelligent as Zo herself. Mrs. Gallilee's science seemed to frighten her.

The researches which established this result also proved the elementary gases, generally, to be highly transparent to radiant heat. This, again, led to the proof of the diathermancy of elementary liquids, like bromine, and of solutions of the solid elements sulphur, phosphorus, and iodine.

The Diathermancy of Ebonite, by some incomprehensible process, drove her bewildered mind back on her old companion. "I want to give Teresa a little pleasure before we part," she said timidly; "may she go with us?" "Of course!" cried Mrs. Gallilee. "And, now I think of it, why shouldn't the children have a little pleasure too? I will give them a holiday.