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are cold. Some are light and some are dark. Some are charged with ozone. Passing through an ozone cloud causes hoarseness - it acts upon the mucus membranes, and is first perceptible by smell, and the twinging sensation it produces upon the cuticle of the hands and face. When the Balloon comes near a cloud, electrical excitement takes place: It also occurs when the Balloon is passing from one current of air, into another. The finer part of the light sand ballast used by the aeronaut, is drawn in a stream from the car up and against the body of the Balloon. Also the fine cut index paper used by aeronauts, is, in such cases drawn up against the Balloon, hanging there for a while with a tremulous motion, and then falling off. I have heard it make a crepitating noise when thus thrown out by handsful. The stillness is so profound above the clouds, that a noise, not perceptible on the earth, is quite discernible there.

It is remarkable how suddenly at times, the currents of air strike the balloon, causing it to swing slightly to and fro, as well as to rotate on its vertical axis. These sharp crossing currents are always attended with marked electrical evolutions. The gas in a balloon that is perfectly transparent when it leaves the earth, is changed into a cloud when [[strikethrough]] the [[/strikethrough]] it gets into a region of clouds. And it assumes this character of cloud in a perfectly clear atmosphere, when the balloon reaches the region of frost. I have had my hair thickly covered with hoar-frost on a fourth of July, and cloud issuing from the neck of the balloon, at an elevation of 19,000 feet.

The atmosphere is always clear and transparent after a rain-storm - it is only then that an observer aloft has a great scope of view of mundane objects. On such occasions the view in ascending from the sea-shore is very imposing. It is well known, that from the land, or the surface of the sea, a ship is not visible when twenty miles off. The earth's convexity being about eight inches to the mile, and this obstruction