If we knew how much force the sun had in the beginning, and would subtract from this amount all that it has given away to the present time, we might be able to form some estimate of its assets to-day. We know not what the sun’s resources are. We know not by what methods it has been replenishing its supplies of light and heat for ages past; whether by chemical combination, meteoric impact, or condensation; we only know by so much as it has in the ages past parted with, by so much less force it has to-day. That it has been able to supply our world and others like it, however, with heat and light and physical life for ages, is not at all strange when we remember what an immense ball of fire the sun is. It has a diameter of a million miles, in round numbers. Storms, which travel across our world at the rate of sixty miles an hour, would move across the surface of the sun at the rate of twenty thousand miles an hour. The flames of a burning forest, which on our world would rise one hundred feet in the air, on the sun would rise to the height of two hundred thousand miles. The sun, too, has enough force on hand to supply our earth and others with heat for untold ages yet to come, but unless its supply is replenished, the time will come when it will be bankrupt and nothing but a burnt out char in the heavens. This is so, because the sun is the center of that great natural realm, the universal law of which is the law of exclusiveness. In accordance with this law what the sun has in the way of force the other planets do not have, and what other planets obtain from the sun that body has forever lost. This is only another name for the law of the correlation of forces. This law applies not only to the force of the sun, but to all forces on this earth which come from that body. What one tree gathers into itself is at the expense of the general fund of force which goes to make trees. What one bird takes into his body is at the expense of all force which goes to make birds. What one man takes into his physical frame is at the expense of the general fund of force which goes to make human bodies. Whatever amount of force is contained in the cloud, in conserved water to turn the wheel, or in conserved electricity to carry the message, is at the expense of the general fund of force.