July 17 10 8 14544 240 26.7 20.5 240-27 +3:5 0.0 +6.2 +2°7-3'5 Between 15,000 and 16,000 feet. July 17 10 11 15704 246 22.7 22'0 215 +19 +2·6 +3°3 +0·7 +14 +07 Between 16,000 and 17,000 feet. July 17 10 15 16914 24°3 19°8 230 20.8 +45 +13 +35-32-10 +2.2 Aug. 18 231 -0'7 6'0 -6.7 July 17 10 25 18844 Between 18,000 and 19,000 feet. 249 244 251 242 +0.5 −0·2 +0.7 −0·7 +0.2 +0.9 -84 Aug. 18 2 35 18039 .. -54 -11'5 .. -11'5 By taking the mean of each column of differences in each 1000 feet of elevation, the next Table is formed. TABLE X.-Showing the mean differences between the Temperatures of the Dew-point as found by the use of the Dry- and Wet-bulb Thermometers and by Daniell's and Regnault's Hygrometers, and comparison of the results as found from the two Hygrometers. -4'I -2'7 1+3.5 1+26 17000 +4.5 1+13 18000 +0.5 I -02 12000 39 ... » 14000 14000 » 15000 15000 16000 +1.9 16000 "" 17000 " -14 I 1-13 2 I O'O I ... +62 1+33 I +0.7 I+0'71 1-30 -8.62 -1.5 -2.7 I -1'0 +2.7 I -3.5 1+14 I +07 I I-392 +22 I -0'7 1 −6·63 +0.9 | 1 +104 +0.5 6 +046 -0.33-02 -0°2 |