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Rh seven posts projecting from the upper surface of the wooden box. A single wire attached to a post upon the side of the box had at its other extremity a small, curved metal plate attached to the inside of a leather collar. This collar Zoanthrohago adjusted about the neck of the rodent so that the metal plate came in contact with its skin at the base of the skull and as close to the hypophysis gland as possible.

He then turned his attention once more to the wooden box, upon the top of which, in addition to the seven binding posts, was a circular instrument consisting of a dial about the periphery of which were a series of hieroglyphics. From the center of this dial projected seven tubular, concentric shafts, each of which supported a needle, which was shaped or painted in some distinguishing manner, while beneath the dial seven small metal discs were set in the cover of the box so that they lay in the arc of a circle from the center of which a revolving metal shaft was so arranged that its free end might be moved to any one of the seven metal discs at the will of the operator.

The connections having all been made, Zoan­throhago moved the free end of the shaft from one of the metal discs to another, keeping his eyes at all times intently upon the dial, the seven needles of which moved variously as he shifted the shaft from point to point. Elkomoelhago was an intent, if somewhat ­