Saturn is believed to be composed mainly of gases and vapors or to be at least in a fluid condition with no solid crust. Its density is less than that of any other planet in the solar system, being only 0.70 as compared with water as unity. This is only about one-half as great as the density of Jupiter, which is somewhat greater than that of water. The weight of the earth is five and one-half times that of water. If the earth and Saturn were two balls immersed in an ocean large enough to hold them, the earth would sink like a ball of metal while Saturn would float like a ball of wood. A white belt may usually be seen near the equator of Saturn and curious pale gray caps cover both the poles. Between these are faint colors and other dim belts. Its colors as markings are not as pronounced as in the case of Jupiter, on which they are far more distinct as this latter planet is 400,000,000 miles closer to the earth. The mysterious gray color of the caps at the poles of Saturn remain an enigma and the spectroscope shows that Saturn contains some substance which has not yet been identified. Saturn's equator is inclined to the plane of its orbit at an angle of 27 degrees--a direct contrast to the axis of Jupiter which is almost perpendicular. This would cause Saturn to have very marked seasonal changes and very long seasons for one of its years is equal to almost 30 of ours. Day and night on Saturn are very short for this huge planet turns completely around in 10¼ hours. With only 5⅛ hours of daylight (and Saturn receives only ¹⁄₉₀th as much light per unit area as that received by the earth), one would hardly get up before it was time to go to bed. But perhaps the future Saturnian will be so constructed that he does not have to spend so many hours in sleep, or perhaps, as in the Golden Age when the god Saturn ruled on earth and the needs of man were brought forth without labor, this length of day would be quite enough for general entertainment. Again, they might be such quick-witted creatures that they could accomplish a thing while we were thinking about it, or, yet again, they might not care to slave all their days in order to indulge in such foolishly complex lives as we do here and 5⅛ hours would prove a great plenty. How we do ramble on! Yet is it not a little fun to stop a moment and conjecture about folks on a distant world? Perhaps they could never be--perhaps Saturn may never mature into a habitable globe--but then, who knows? THE RINGS OF SATURN