The next planet to the earth is MARS; fiery Mars, generally shining with a ruddy light. It used to be thought that the color of Mars's "blood-red shield" was caused by the absorption of the solar rays; but this idea has been refuted, and it is now believed to be due to the color of its soil. According to the former idea, an angry man, who is like Mars, the god of war, must be one who has absorbed all other colors for his own use, and only shows the red rays to others; while the more modern notion, that the soil of the planet gives it its distinctive color, teaches us that, where there is a fiery nature, there will be a warlike exhibition of it unless it is restrained by grace. Mars is about 140,000,000 miles from the sun; it is much smaller than our earth, its equatorial diameter being 4363 miles. Traveling at the rate of 53,600 miles an hour, it takes 687 days to complete its revolution round the sun. * * * * * Between the orbits of Mars and Jupiter there is a wide zone, in which, for many centuries, no planets were visible; but the astronomers said within themselves, "There must surely be something or other between Mars and Jupiter." They could not find any great planets; but as telescopes became larger and more powerful, they observed that there was a great number of ASTEROIDS or PLANETOIDS, as some term them. I do not know how many there are, for they are like some of our brethren's families, they are daily increasing. Some hundreds of them have already been discovered; and by the aid of telescopic photography, we may expect to hear of the finding of many more. The first asteroid was identified on the first day of the present century, and was named Ceres. Many of them have been called by female mythological names, I suppose because they are the smaller planets, and it is considered gallant to give them ladies' names. They appear to vary from about 20 to 200 miles in diameter; and many have thought that they are the fragments of some planet that once revolved between Mars and Jupiter, but that has been blown up, and gone to pieces in a general wreck.