The description reads "(39) Tireless Niagara - Horseshoe Falls from above - U.S.A.". The reverse states "We are standing on the Canadian side of the river, looking S.E. across the enormous curve of the Horseshoe toward the Dufferin Islands on the Canadian side. 'This is close enough. The time will come undoubtedly when no man can reach this point, when the rocks on which we stand will break and crash into the gulf above which they hang. Table Rock one of the best known points about Niagara in the past, used to extend out over the river from the bank just behind us. It was originally very large but great masses, sometimes a hundred feet in length by fifty in width, have broken off at different periods, the last in 1883, until the whole rock is gone. Off to our left is the centre of the Horseshoe. It is easy to see that in that direction the water is going over in a solid mass, thousands of tons each second, to the river 150 feet below. While the amount of water passing over these rocks varies somewhat according to the height of the river. It has been estimated that the average amount is 12,000,000 cubic feet per minute, that is, about 375,000 tons...Since 1842 the whole contour of these falls has been worn away at the rate of about 2 1/10 ft. per year. In the centre of the Horseshoe where the bulk of the water passes, nearly five feet of rock are worn away each year. The falls have receded 100 feet within the memory of the men now living.' From Niagara Through the Stereoscope, with special 'keyed' maps, published by Underwood & Underwood"
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