GRAVITY OF VAPOUR. 167 
Twelve Experiments. 
—_— 
~ 
2 3B ag8 
2 Spe le 
3 £ |$s3° 
wa ®D =°Cse 
2 a a | 
E a2 = Case 
ee ro BY 
et Bs2ee 
degrees 
19.77 9.27 125 82.53 2.66 
20.10 9.50 132 83.00 2.67 
20.75 10.15 170 82.00 2.64 
21.00 10.20 185 80.47 2.59 
21.37 10.50 204 82.54 2.66 
21.50 11.14 240 81.92 2.64 
21.75 10.95 230 81.66 2.63 
21.50 10.80 220 81.23 2.62 
21.50 10.80 215 81.38 2.62 
21.50 10.72 210 81.36 2.62 
21.60 10.92 212 80.00 2.58 
230 2.63 
198 2.63 
When the deduction is made for expansion of 
glass and mercury, 100 cubic inches of the va- 
pour at 60° and 30 inches pressure will weigh 
79.46 grains, and its specific gravity will be 
2.55, atmospheric air being 1. 
VAPOUR OF PyrRoxiLic SPIRIT. 
Tube 40 inches long and capacity 6.08 cubic 
inches, capacity of the ball 4.3 cubic inches, 
specific gravity of the spirit .810, two grains in 
