SUBTERRANEAN LAKE IN MISSOURI.
In Oregon county, Missouri, and Fulton county, Arkansas, are grouped Grand gulf, Mammoth spring and Spring river. Of these natural curiosities. Grand gulf is the most celebrated. Two shallow streams, distant about a quarter of a mile from each other. How in the same direction over an elevated plateau, and suddenly drop down into canons, 500 feet deep. These unite atiom half a mile below, and a natural bridge is formed by the action of the water, which has tunneled a mountain lying directly athwart their course. After passing through this mountain, the stream tunnels for several hundred feet through another mountain, after which it spreads out into a very large underground lake, whose area has never been ascertained. From this lake, a-, from a reservoir, is supplied the Mammoth springthe largest in the world—whose flow is (a 000 cu. ft. per minute. One very noticeable peculiarity of this soring is that, when the great canons already referred to are full of water sometimes, to the depth of hundreds of feet and up to the arch of the natural bridge, the flow of the Mammoth spring is not increased. This spring covers eighteen acres of ground 200 ft. deep with water as clear as crystal, and unceasingly pours its 60,000 cu. ft. of water a minute over a solid p’-‘sonrv drain 170 ft long and twenty-eight feet Oh. It is spanned bv an immense steel bridge ard navigated by naphtha launches.