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226 stature of Zuanthrol we should be able to increase it; but, alas, I have tried this and failed. But wait, let us repeat the experiment precisely as it was originally carried out and then, by reversing it, we shall, perhaps, be enabled to determine why I have failed in the past."

He stepped quickly across the room to one of a series of large cupboards that lined the wall and opening the door of it revealed a cage in which were a number of rodents. Selecting one of these he returned to the table, where, with wooden pegs and bits of cord he fastened the rodent securely to a smooth board, its legs spread out and its body flattened, the under side of the lower jaw resting firmly upon a small metal plate set flush with the surface of the board. He then brought forth a small wooden box and a large metal disc, the latter mounted vertically between supports that permitted it to be revolved rapidly by means of a hand crank. Mounted rigidly upon the same axis as the revolving disc was another which remained stationary. The latter disc ap­peared to have been constructed of seven seg­ments, each of a different material from all the others, and from each of these segments a pad, or brush, protruded sufficiently to press light­ly against the revolving disc.

To the reverse side of each of the seven seg­ments of the stationary disc a wire was attached, and these wires Zoanthrohago now connected to