What the conversion of the strength of this Titan (for ages entirely wasted and for a century after Hennepin only a scenic wonder) means, or may mean, to industry in the future is intimated in some statistics, furnished by a recent writer on the Great Lakes, showing the relative cost per month of a certain unit of power in a number of representative American cities. [Footnote: "Assuming the maximum power used to be one hundred horse-power, the number of working hours a day to be ten, and the 'load factor,' or average power actually used, to be seventy-five per cent of the total one hundred, the cost per month in the cities named is as [above]."--Curwood, "The Great Lakes," p. 135.] Boston $937.50 Philadelphia 839.25 New York 699.37 Chicago 629.43 Cleveland 559.50 Pittsburgh 419.62 Buffalo 184.91 Niagara Falls 144.17 These figures are more significant as one contemplates the diminishing supply of coal in coming centuries, if not decades. According to the estimate of a reliable authority the available and accessible coal supply of the United States will be exhausted at the present rate of exploitation by the year 2027, and the entire supply by the year 2050. Such statistics intimate the advantage possessed, perhaps beyond any other site in America, by the strip of shore on which La Salle's men, from the banks of the Seine, and Hennepin, the priest from Calais, that December night in 1678 encamped, building their bivouac fires amid the snows, three miles above the falls--and so opening to the view of the world a natural source of power and wealth more valuable than extensive coal-fields or rich mines of gold or silver. It was but a great waterfall to La Salle and Tonty and Hennepin--an impeding, noisy, hostile object. And to the half-mutinous, quarrelsome workmen (French, Flemings, Italians) it was a demon, no doubt, whose very breath froze their beards into icicles. It was, in reality, potentially the most beneficent single, incarnate force bounded by any one horizon of sky, in that new world, developed by the tipping of the continent a little to the eastward after the upper lakes had been formed and the consequent emptying of their waters into the St. Lawrence instead of the Gulf of Mexico. In January, 1679, a file of burdened men, some thirty in number, toiling slowly on their way over the snowy plains and "through the gloomy forests of spruce and naked oak trees," the priest accompanying with his altar lashed to his back, reached a favorable spot beside calm water several miles above the cataract: the site is identified as situate a little way above the mouth of Cayuga Creek, just outside the village of La Salle, in the State of New York. There is a stone erected by the local historical society to mark the spot. When I saw the bronze tablet the inscription was almost illegible, covered, as it was, with ice and the snow that was at that very hour falling upon it.