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The penetration powers of the different currents was also experimented with. The medium used was sheets of blotting paper saturated with a weak solution of pot. iodide. Owing to the chemical action of the spark the iodide became decomposed, and wherever the paper was penetrated it was readily

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traceable owing to the brown iodide color. It was interesting to note, that with an electrode on either side of twenty thicknesses of blotting paper (1) the high-frequency spark acted on the pot. iodide throughout. (2) That the D'Arsonval re

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acted most, nearer both poles. (3) That the solenoid-condensers of Morton and the Tesla were more deeply penetrative. It was not determined that either the positive or the negative end of the spark in the different instances was the more penetrative.

Following the clues given as to penetration the writer has been treating tuberculous glands in this way by placing a

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