A peculiar feature of the street lighting of Toonol, and in fact the same condition applies to the lighting of other Barsoomian cities I have visited, I noted for the first time that night as I waited upon the landing stage for the return of Bal Zak with the watchman. The luminosity below me seemed confined directly to the area to be lighted; there was no diffusion of light upward or beyond the limits the lamps were designed to light. This was effected, I was told, by lamps designed upon principles resulting from ages of investigation of the properties of light waves and the laws governing them which permit Barsoomian scientists to confine and control light as we confine and control matter. The light waves leave the lamp, pass along a prescribed circuit and return to the lamp. There is no waste nor, strange this seemed to me, are there any dense shadows when lights are properly installed and adjusted; for the waves in passing around objects to return to the lamp, illuminate all sides of them. The effect of this lighting from the great height of the tower was rather remarkable. The night was dark, there being no moons at that hour upon this night, and the effect was that obtained when sitting in a darkened auditorium and looking upon a brilliantly lighted stage. I was still intent upon watching the life and colour beneath when we heard Bal Zak returning. That he had been successful in his mission was apparent from the fact that he was conversing with another. Five minutes later we crept quietly from our hiding place and descended to the stage below where lay the equilibrimotor depot. As theft is practically unknown upon Barsoom, except for purposes entirely disassociated from a desire to obtain pecuniary profit through the thing stolen, no precautions are taken against theft. We therefore found the doors of the depot open and Gor Hajus and Dar Tarus quickly selected four equilibrimotors and adjusted them upon us. They consist of a broad belt, not unlike the life belt used aboard trans-oceanic liners upon Earth; these belts are filled with the eighth Barsoomian ray, or ray of propulsion, to a sufficient degree to just about equalize the pull of gravity and thus to maintain a person in equilibrium between that force and the opposite force exerted by the eighth ray. Permanently attached to the back of the belt is a small radium motor, the controls for which are upon the front of the belt. Rigidly attached to and projecting from each side of the upper rim of the belt is a strong, light wing with small hand levers for quickly altering its position. Gor Hajus quickly explained the method of control, but I could apprehend that there might be embarrassment and trouble awaiting me before I mastered the art of flying in an equilibrimotor. He showed me how to tilt the wings downward in walking so that I would not leave the ground at every step, and thus he led me to the edge of the landing stage.