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 bewildered, observer, and the slave, Zuanthrol, unobserved, had moved nearer the table that he might better watch this experiment which might mean so much to him. Zoanthrohago continued to manipulate the revolving shaft and the needles moved hither and thither from one series of hieroglyphics to another, until at last the walmak appeared satisfied. "It is not always easy," he said, "to attune the instrument to the frequency of the organ upon which we are working. From all matter and even from such incorporeal a thing as thought there emanate identical particles, so infinitesimal as to be scarce noted by the most delicate of my instruments. These particles constitute the basic structure of all things whether animate or inanimate, corporeal or incorporeal. The frequency, quantity and rhythm of the emanations determine the nature of the substance. Having located upon this dial the coefficient of the gland under discussion it now becomes necessary, in order to so interfere with its proper functioning that the growth of the creature involved will be not only stopped but actually reversed, that we decrease the frequency, increase the quantity and compound the rhythm of these emanations. This I shall now proceed to do," and he forthwith manipulated several small buttons upon one side of the box, and grasping the crankhandle of the free disc revolved it rapidly. The result was instantaneous and startling. Before their eyes Elkomoelhago, the king, and Zuanthrol, the slave, saw the rodent shrink rapidly in size, while retaining its proportions unchanged. Tarzan, who had followed every move and every word of the walmak, leaned far over that he might impress indelibly upon his memory the position of the seven needles. Elkomoelhago glanced up and discovered his interest. "We do not need this fellow now," he said, addressing Zoanthrohago. "Have him sent away."