GRAVITY OF VAPOUR. 169 
Fah.) he had in his possession. Its acidity was 
such that 5 ounces apothecaries’ weight of lime 
water required 7 water grain measures of it in 
order to be made neutral. The same quantity 
of that lime water required 264 grains, by mea- 
sure of dilute sulphuric acid of 1.134 specific 
gravity. The 42 inch tube was used. 
Twelve Experiments. 
Pressure. 
Temperature 
Wt. of LUO cub. 
inches of 60° 
temp. and 30 in. 
inches. | degrees. 
16.30 221 
16 70 228 
16.60 240 
17.10 232 
17.65 236 
17.65 239 
17.75 244 
18.55 258 
18.15 248 
17.75 240 
17.75 242 
17.85 244 
17.56 239.3 
When the deduction is made for the expan- 
sion of glass and mercury, 100 cubic inches 
will weigh 74 grains, and the specific gravity 
will be 2.37, atmospheric air being 1. 
Oo 
