rature is distributed: for this purpose all the observations of the temperature of the air taken within this distance of the earth were laid down upon large diagrams; a curved line was made to pass through or near them, and the reading at every 100 feet was taken from these curves, and those at every even hundred were inserted in the following Tables, as well as those from the projected curves as found by joining the observations themselves, and in this way the following Tables were formed: TABLE V.-Showing the Mean Temperature of the Air at every 200 feet up to 5000 feet. July 17.-The results are dependent upon the observations before leaving the earth, joined to those taken at and above 3800 feet; but they accord with others under the same state of the sky, indicating an almost uniformly decreasing temperature until the thick cloud was reached. July 30. The fluctuations on this day are better shown here than in the preceding section; there seem to have been no fewer than four or five different strata, on this day, within 7000 feet of the earth, experienced during the ascent and passage of the balloon till the time of descent, which was rapid, and during which the increase of temperature was gradual throughout.. |