You will remember that the great Sahara Desert is a vast tract of thousands of square miles where no rain falls, and where the heat is intense. There is, however, much moisture in the air that floats over the plains, but the reason that no rain falls is because there are no mountains in that portion of the globe for thousands of miles. Now suppose that there were to be no rain at all, and people should undertake to water the earth by bringing the water from the rivers. On an average of about thirty-three inches of rain fall upon the surface of the entire earth each year, in some places more, in others less. The weight of this water in one single square mile would be nearly two and one-half millions of tons, and if this water which falls upon one single square mile had to be drawn in cars, it would require 100,000 carloads of water to keep this one single mile as wet as God usually keeps it throughout the year by the rain from heaven. I think you will see, from what I have said, that all the cars in the entire United States, and there are hundreds of thousands of them, would not be sufficient to haul water from the rivers for any considerable distance to keep more than ten miles square of earth watered. But you can also see that if all these cars were to be run on a piece of ground only ten miles square, that entire piece of ground would be almost completely covered with railroad tracks, and we would scarcely be able to raise anything on it in the way of grain or vegetables or food of any kind. But even if we could successfully water ten miles square of land, what would that be compared with the absolute necessity of watering the entire continent and all the continents of the globe in order to make life possible upon the earth. Now the question arises, how does God accomplish this great result? [Illustration: Train of Cars.] I suppose you have all noticed the teakettle when it is upon the stove and the steam is coming out of the spout, and around the lid. You have there had a practical demonstration of how God can cause the water, which is 800 times heavier than the atmosphere or the air, to rise and float, for you know that any substance heavier than air will always fall to the earth. In the instance of the teakettle you will see how heat causes the water to become steam and thus to rise in the air and float away, rising to the height of the clouds which float two, three and four and sometimes more miles high above the earth. Now, just in this same way God makes the heat from the rays of the sun to cause that from every river and lake and all the expanse of the ocean, as well as from the surface of the earth, there shall constantly arise a very fine vapor, which, although it is somewhat like steam, is still so much finer that you and I cannot see it with our unaided eyes. It is by means of this vapor that God raises the moisture from the oceans and all bodies of water and from the earth, to fall again in gentle showers.