the 12th of June, the principal object of which was the attempt to discover the means of steering in a certain direction:—
"M. de Verley and myself mounted in the balloon," says Guyton de Morveau, "at seven o'clock. We rose rapidly and in an almost perpendicular direction. The fall of the mercury in the barometer was scarcely perceptible when the dilation of the hydrogen gas in the balloon had become considerable. The globe swelled out, and a light vapour around the mouth announced to us that the gas was commencing to escape by the safety-valve. We assisted its escape by pulling the valve-string.
"Having reduced the dilation sufficiently for our purposes, we resolved to attempt the working of the balloon before the whole town and to turn it from the east to the north. We saw with pleasure that our machinery answered By the working of the helm, the prow of our air-boat was turned in the direction we desired. The oars, working only on one side, supported the helm, and altogether we got on as we wished. We described a curve, crossing the road from Dijon to Langres. The mercury had descended to 24 inches 8 lines, which announced that we were gradually rising. We attempted for some time to follow the route to Langres, but the wind drove us off our course in spite of all our efforts. At nine o'clock our barometer informed us that we had ascended to the height of 6,000 feet. M. de Verley took advantage of this elevation to put some touch wood to a burning-glass 18 lines in diameter, and the touch wood lighted immediately."
The aeronauts decided to direct their course for Dijon. After re-setting the helm with this intention, they worked their oars, and proceeded in that direction more than 1,000 feet. But heat and fatigue obliged them to suspend their
