J. P. Cooke—Buoyancy of the Atmosphere. 41 
this constant, and adding or subtracting the product, as the case 
may be, to or from the observed weights. 
First Series. 
No. 1883. Weight. 0. Hy H. reduced. Result. 
1 May 1 87°5304 17° 304°0 314°0 87-5346 
2 May 2 : 304°2 314°2 87-5346 
May 2 87°5314 19°5 03°2 310°7 87°5346 
4 May 3 87°5322 301°0 308-0 87-5346 
5 May 4 87°53205 20°5 301°9 308°4 875346 
6 May 4 21 302°5 808°5 87-5346 
7 May 6 8775316 18 300°8 309°8 87-5345 
8 May 7 87°5320 19 300°0 308°0 875344 
9 May 8 87-5328 19°5 298°9 306°4 87-5347 
10 May 9 8753245 302°2 307-2 87°5346 
11 May 11 299°5 304°5 87 5346 
12 May Il 87°5333 19°5 296°2 303°7 87-5344 
1 May 19 87°5317 303°5 309°5 87-5346 
14 May 21 15345 ~*~ 98 296°2 300-2 87°5346 
15 May 22 87°5336 22° palo | Bae 303-0 8775345 
Greatest weight, 87-5345 Barometer, 300°2 
Smallest weight, 87-5303 ts 314°2 
Differences, 14:0 
42 
Constant = 4°2 m. g. + 14:0 = 0°3 m. g. 
ceedingly hot weather when the temperature was rapidly chang- 
ing; and it was evident that the insignificant differences remain- 
Ing arose from the circumstance that the thermometer was not 
nearly so sensitive as the air in the balance-case, following the 
change of temperature of the air after a considerable interval of 
time. It was curious to notice the slight increase of weight, 
