Directly ahead of them, distant perhaps a hundred yards, lay a yellowish-brown mass of unusual octagonal shape. One end contained a small oval opening, but the men from the Earth looked in vain for any creature to emerge from it. The doctor silently set to work with his apparatus. From an air-tight double-doored compartment he obtained a sample of the ether outside the car; and with the aid of previously arranged chemicals, quickly learned the truth. There was no air. Not only was there no oxygen, the element upon which all known life depends, but there was no nitrogen, no carbon dioxide; not the slightest trace of water vapor or of the other less known elements which can be found in small amounts in our own atmosphere. Clearly, as the doctor said, whatever air the astronomers had observed must exist on the circumference of the planet only, and not in this sun-blasted, north-central spot. On the outer walls of the cube, so arranged as to be visible through the windows, were various instruments. The barometer showed no pressure. The thermometer, a specially devised one which used gas instead of mercury, showed a temperature of six hundred degrees, Fahrenheit. No air, no water, and a baking heat; as the geologist remarked, how could life exist there? But the architect suggested that possibly there was some form of life, of which men knew nothing, which could exist under such circumstances. They got out three of the suits. These were a good deal like those worn by divers, except that the outer layer was made of non-conducting aluminum cloth, flexible, air-tight, and strong. Between it and the inner lining was a layer of cells, into which the men now pumped several pints of liquid oxygen. The terrific cold of this chemical made the heavy flannel of the inner lining very welcome; while the oxygen itself, as fast as it evaporated, revitalized the air within the big, glass-faced helmet. Once safely locked within the clumsy suits, Jackson, Van Emmon, and Smith took their places within the vestibule; while the doctor, who had volunteered to stay behind, watched them open the outer door. With a hiss all the air in the vestibule rushed out; and the doctor earnestly thanked his stars that the inner door had been built very strongly. The men stepped out on to the ground. At first they moved with great care, being uncertain that their feet were weighted heavily enough to counteract the reduced gravitation of the tiny planet. But they had been living in a very peculiar condition, gravitationally speaking, for the past three days; and they quickly adapted themselves. After a little shifting about, the three artificial monsters gave their telephone wires another scrutiny; then, keeping always within ten feet of each other, so as not to throw any strain on the connections, they strode in a matter-of-fact way toward the nearest doorway.