opened to allow a portion of the gas to escape, an explosion would speedily ensue. At this critical moment he became somewhat excited, and looking over the side of his car, he observed the sparkling coruscations of lightning springing from cloud to cloud, a mile beneath him, as the thunder-storm was passing, in its last remnants, below. He took out his watch, noted on his log-book the time--twenty minutes past two--and as he was about returning it to his pocket, thinking at the time whether it were not best, by opening the valve, to abandon, for the present, his favorite idea, the balloon exploded. His confidence in the success of the experiment never forsook him, and yet he admits that this was a moment of awful suspense. The gas rushed with a tempestuous noise from the rupture in the top, and in less than ten seconds, the balloon was emptied of every particle of hydrogen. The descent at first was rapid, and in a moment or two, on looking up, he discovered that the balloon was canting over, but the weight of the car counteracted its tilting tendency, giving it an oscillating motion, which it retained until it reached the earth, which it struck with a violent concussion, and the car striking the earth obliquely, Mr. Wise was thrown forward from it about ten feet. The landing was made on a farm about ten miles from Easton, and many minutes had not elapsed before he had resolved in his mind to repeat the experiment in Philadelphia on the first opportunity. Having arrived in Philadelphia in the month of September immediately following, he consulted several scientific gentlemen as to his intention. Doubtful of the safety of the experiment, though neither questioning the philosophy of atmospheric resistance, nor the theory of converting the balloon into a parachute, they earnestly endeavored to dissuade him from his purpose. But confident of the perfect safety with which, on scientific principles, he would descend, he publicly announced that he would ascend on the first of October, and explode the balloon at the height of upward of a mile. On the day advertised, at twenty minutes before five o'clock, afternoon, he left the earth in the presence of assembled thousands, and rose almost perpendicularly, in a perfectly clear sky. When the explosion took place, the lower part of the balloon did not immediately invert, as in the former experiment, for in this case the balloon burst open from top to bottom, and caved sideways. At the first discovery of this, he was somewhat alarmed, fearing that it might come down with a continuous accelerated velocity; but from this anxiety he was soon relieved, for it caught the wind like the mainsail of a ship, and _slid_ down upon the atmosphere in a spiral course with a _uniform_ velocity. The concussion, though from the apparent rapidity of the descent it threatened to be violent, was not harder than that which would follow the jumping from an elevation of ten feet to the ground.