376 REPORT—1862. 
An Account of Meteorological and Physical Observations in Eight 
Balloon Ascents, made, under the Auspices of the Committee of the 
British Association for the Advancement of Science at Manchester, 
by James GuaisHer, F.R.S., at the request of the Committee, con- 
sisting of Colonel Sykes, Professor Airy, Lord Wrottesley, Sir D. 
Brewster, Sir J. Herschel, Dr. Lloyd, Admiral FitzRoy, Dr. Lee, 
Dr. Robinson, Mr. Gassiot, Mr. Glaisher, Dr. Tyndall, Mr. Fair- 
bairn, and Dr. W, A. Miller. 
Tue objects to which the Committee resolved to devote their principal atten- 
tion were the determination of the temperature and hygrometric condition 
of the air at different elevations above the earth’s surface. In addition to 
which, several other secondary objects were to be carried out if possible, as 
follows :— 
§ 1. Oxssecrs or tHE EXPERIMENTS, 
The primary objects were— 
The determination of the temperature of the air, and its hygrometrical 
states, at different elevations, as high as possible. 
The secondary objects were 
To determine the temperature of the dew-point by Daniell’s dew-point 
hygrometer, by Regnault’s condensing hygrometer, and by dry- and wet-bulb 
thermometers as ordinarily used, as well as when under the influence of the 
aspirator; so that considerable volumes of air were made to pass over both 
their bulbs, at different elevations, as high as possible, but particularly up 
to those heights where man may be resident, or where troops may be 
located, as in the high lands and plains in India, with the view of ascer- 
taining what confidence may be placed in the use of the dry- and wet-bulb 
thermometers at those elevations, by comparison with the results as found 
from them, and with those found directly by Daniell’s and Regnault’s hygro- 
meters, and to compare the results as found from the two hygrometers 
together. 
To compare the readings of an aneroid barometer with those of a mercurial 
barometer up to 5 miles. 
To determine the electrical state of the air. 
To determine the oxygenic condition of the atmosphere by means of ozone 
apers. 
; To determine the time of vibration of a magnet on the earth, and at 
different distances from it. 
To collect air at different elevations. 
To note the height and kind of clouds, their density and thickness. 
To determine the rate and direction of different currents in the atmosphere, 
if possible. 
To make observations on sound, 
To note atmospherical phenomena in general, and to make general obser- 
vations, 
Instruments and Apparatus. 
The instruments used were mercurial and aneroid barometers; dry- and 
wet-bulb thermometers; Daniell’s dew-point hygrometer; Regnault’s con- 
densing hygrometer; maximum and minimum thermometers; a magnet for 
