The moon, being the nearest to the earth of all the heavenly bodies, has always occupied the imagination of men. Many fanciful accounts have been written of voyages to the moon, of which the following story by Edgar Allan Poe is among the best. So wonderful has been the advance of science that it is conceivable that at some distant time in the future the inhabitants of this world may possibly be able to visit the beautiful body which lights the night for us. I After a long and arduous devotion to the study of physics and astronomy, I, Hans Pfaal of Rotterdam, at length determined to construct a balloon of my own along original lines and to try a flight in it. Accordingly I had made an enormous bag out of cambric muslin, varnished with caoutchouc for protection against the weather. I procured all the instruments needed for a prolonged ascent and finally prepared for the inflation of the balloon. Herein lay my secret, my invention, the thing in which my balloon differed from all the balloons that had gone before. Out of a peculiar [v]metallic substance and a very common acid I was able to manufacture a gas of a density about 37.4 less than that of hydrogen, and thus by far the lightest substance ever known. It would serve to carry the balloon to heights greater than had been attained before, for hydrogen is the gas usually used. The hour for my experiment in ballooning finally arrived. I had chosen the night as the best time for the ascension, because I should thereby avoid annoyances caused by the curiosity of the ignorant and the idle. It was the first of April. The night was dark; there was not a star to be seen; and a drizzling rain, falling at intervals, made me very uncomfortable. But my chief anxiety was concerning the balloon, which, in spite of the varnish with which it was defended, began to grow rather heavy with the moisture. I therefore set my assistants to working, and in about four hours and a half I found the balloon sufficiently inflated. I attached the car and put all my implements in it--a telescope, a barometer, a thermometer, an [v]electrometer, a compass, a magnetic needle, a seconds watch, a bell, and other things. I had further procured a globe of glass, exhausted of air and carefully closed with a stopper, not forgetting a special apparatus for condensing air, a copious supply of water, and a large quantity of provisions, such as [v]pemmican, in which much [v]nutriment is contained in comparatively little bulk. I also secured a cat in the car. It was now nearly daybreak, and I thought it high time to take my departure. I immediately cut the single cord which held me to the earth, and was pleased to find that I shot upward with [v]inconceivable rapidity, carrying with all ease one hundred and seventy-five pounds of leaden ballast and able to have carried as much more.