To quote from page 100: “As one of the wonders of the Gap must be counted the marvelous lake upon Tammany; a lake so singular that popular superstition has been tempted to add a final touch to its surpassing strangeness, and declare it has no bottom. As if in quaint climax to her wild work, Nature, after riving the mountain to its very base, here places beside the chasm on the very apex of the lofty peak a peaceful lake.” This feature of lakes could be extended indefinitely, but something must be said about the smaller influences that produce them. Every lake is but a mammoth spring, or reservoir of numerous springs that feed into its base. The provision by nature of this inexhaustible reservoir of fresh water is beyond doubt the most essential of any other bounty bestowed upon every living thing on Earth’s surface. The principle of centrifugal motion and power is here developed to its highest advantage. Every man that has ever turned a grindstone at early morning to prepare a dull scythe for its day’s work, has no doubt observed the result of frequent pouring on of water. If he turned slow, it would drizzle off at the bottom, supposed to obey the Law of Gravitation; but if he turned just fast enough, he could keep about a pint of water on the surface of a stone four inches thick and two feet in diameter. Increasing the speed results in throwing the water off in all directions. If yarn or cloth wet from a tank or vat is put in a tub latticed outside and subjected to rapid revolutions, it can be thoroughly dried in a brief time. The process of separating cream from milk is done on the same principle by which butter can be made in ten minutes’ time from milking. The familiar trick of whirling a pail of water over one’s head, is complete proof in itself that water seeks the surface and center of motion, and that all these results are from centrifugal force. A funnel of large, or any capacity, filled and a plug at the bottom removed to admit its discharge, will evidence that motion at once forms a circle, and that the center is bare while the outside is full. At this point it may be well to call attention to another feature in the river system. The water on the grindstone will give force to this suggestion. At a certain speed the water will tend to the outside of the stone; below speed required to do that, the tendency will be toward the center of the stone, or strictly toward the center of the Earth’s motion. Now let us see what the river system says. Look on your maps and see about where the common divide occurs, which is seemingly not far from the 50th parallel, where centrifugal force is apparently not strong enough to carry the waters toward the Equator, and the principal waters flow toward Symmes’s Hole. Look on your maps. On the 40th parallel sailors have what they call a roaring sea, which is approximately near the divide of waters, going either toward the poles or toward the Equator. V. DAILY MOTION.