Everything was vastly different from what I had been long accustomed to see and to imagine, and I felt quite assured that I was living in a dream. But I knew of no way to convince myself as to my bearings, so I concluded to make the best use of my time and opportunities, and leave questionings to the future. As a physical world Mars bears a most striking resemblance to our Earth. The length of its year is six hundred and eighty-seven of our days, and the length of its day is twenty-four hours and thirty-seven minutes. Its diameter is about one-half that of the Earth and its distance from the Sun is 142,000,000 miles. Even from our own world we can discern through a good telescope the changing colors of the planet, due to the recurring seasons, each one of which is almost twice the length of ours. There is relatively much less water on Mars than is found on our Earth, and gravity on its surface is only thirty-eight per cent. of terrestrial gravity. Imagine, then, how light everything must be. This may account somewhat for the physical proportions of its inhabitants, for they are over twice our size, and in appearance resemble us but little. They have four arms, two extra ones extending from a point just above the knees. The two lower arms act as servants to the two higher. Thus are the four used at one time in harmony. Mars is an older world than ours, and although it receives only one-half as much heat from the sun yet it is almost of the same temperature, owing to a peculiar condition of the atmosphere which we would call "heat retentivity." Some scientists and philosophers will at once say that such atmospheric conditions are contrary to reason and natural law, but they must be informed that on Mars there are chemical elements and affinities not known in our world. It requires but little change in the elementary construction of the atmosphere to render it capable of strong heat-retaining properties. Standing on the surface of this planet, my attention was easily attracted by the two frisky moons called Deimos and Phobos, at the small distance of 14,600 and 12,500 miles respectively. These two moons are constantly flying around the planet, one in about thirty hours and the other in seven and one-half hours. The astronomers of Mars have discovered unmistakable signs of human life on the farthest of these two moons. They are hoping to be able some day to cover the intervening distance and for the first time see their old neighbors face to face.