If it is true that earth receives but a portion of the fearful hydrogen heat that flames in the sun’s photosphere, one-half being restrained that it does not reach the earth, may not the rest as easily be withheld in the far distant space and lie within the sun’s power of gravitation? While the sun is the light and heat of earth and all the planets and their satellites,—as a mother caring for her children,—may not all these planets, with their atmospheres and powers of gravitation, help return to her what she so freely bestows upon them? Is it more difficult to believe this than that we are daily using heat stored for ages in earth by this same wondrous sun whose light and heat, if more or less, would work the destruction of man? When we think of the hundreds of millions of years ago that Saturn and Jupiter were a portion of the sun’s body we should, according to the nebular theory, expect that those bodies would long since have cooled. But if Saturn is to-day a hot, gaseous body of not one-thousandth part the sun’s mass, nor of an equal density with it, how does it happen that it is not cold? As astronomers cannot tell the years it may continue thus hot possibly there may be something about light and heat that is not yet understood? We are told by Dr. Huggins: “The green coronal line has no known representative in terrestrial substances, nor has Schuster been able to recognize any of our elements in the other lines of the corona.” It has been said that “the sun cannot shine forever;” why not? Let us imagine two persons in a room making an agreement that thereafter but one of them shall be in the room at the same time, for as one enters it the other will immediately leave. This they might agree to do every hour, day, year, or millions of years even, could they exist here, and thus keep it up forever. Likewise if the sun’s rays in some manner keep returning to the sun, they may exist forever. For if true that “a particle traveling in a straight line with uniform speed in the same direction is never able to get beyond a certain limited distance from the original position, to which it will every now and then return,” let us apply the theory to a ray of light and see what the result will be. One would think that a ray of light moving through a cold space would certainly cool in one minute, but we find that such is not the case; for this ray of light is the same when it reaches earth as when it started upon its journey. The eighth minute it moved as fast and was identically the same as when first projected from the sun. Thus it ever remains flying through space at the rate of 11 millions of miles each minute, keeping the same speed as long as it can be detected by human invention, and on reaching the sun, its starting point, it must be the same in light, heat, and energy as when it left,—be that time hundreds, thousands, or millions of years,—and is ready to repeat its voyage forever; why not? If for every ray of light that goes out from