A lateral valley extends about six miles from South Fork in a southeasterly direction, at the head of which was located the Conemaugh Lake reservoir, owned and used as a summer resort by the South Fork Hunting and Fishing Club of Pittsburg. In altitude this lake was about 275 feet above the Johnstown level, and it was about two and one-half miles long and one and one-half miles in its greatest width. In many places it was 100 feet deep, and it held a larger volume of water than any other reservoir in the United States. The dam that restrained the waters was nearly 1,000 feet in length, 110 feet in height, ninety feet thick at the base, and twenty-five feet wide at the top, which was used as a driveway. For ten years or more this dam was believed to be a standing menace to the Conemaugh valley in times of freshet, though fully equal to all ordinary emergencies. With a dam which was admitted to be structurally weak and with insufficient means of discharging a surplus volume, it was feared that it was only a matter of time before such a reservoir, situated in a region notorious for its freshets, would yield to the enormous pressure and send down its resistless waters like an avalanche to devastate the valley. This is precisely what it did do. A break came at three o'clock in the afternoon of May 31, caused by protracted rains, which raised the level of the lake. Men were at once put to work to open a sluice-way to ease the pressure, but all attempts were in vain. Two hours before the break came, the threatened danger had been reported in Johnstown, but little attention was paid to it, on the ground that similar alarms had previously proved ill-founded. There is no question that ample warning was given and that all the people in the valley could have escaped had they acted promptly. When the center of the dam yielded at three o'clock, it did so in a break of 300 feet wide. Trees and rocks were hurled high in the air, and the vast, boiling flood rushed down the ravine like an arrow from a bow. It took one hour to empty the reservoir. In less than five minutes the flood reached South Fork, and thence, changing the direction of its rush, swept through the valley of the Conemaugh. With the procession of the deluge, trees, logs, debris of buildings, rocks, railroad iron, and the indescribable mass of drift were more and more compacted for battering power; and what the advance bore of the flood spared, the mass in the rear, made up of countless battering rams, destroyed. The distance from Conemaugh lake to Johnstown, something over, eighteen miles, was traversed in about seven minutes; and here the loss of life and the damage to property was simply appalling. Survivors who passed through the experience safely declare its horrors to have been far beyond the power of words to narrate. After the most thorough possible CHAPTER XXXIV. ST. PIERRE, MARTINIQUE, ANNIHILATED BY A VOLCANO. BY TRUMBULL WHITE.