290 ON THE COMBINATIONS OF 
EXPERIMENT I. 
7534 grains by weight of oil of vitriol, sp. gr. 
1.8436, were suddenly poured to 138.3 grains 
by weight of water (= 1 atom oil of vitriol + 1 
water, ) and well mixed with a thermometer, in a 
glass cup. The mercury in the thermometer 
rose from 50° to 234°, = an increase of 184° of 
temperature. 
The experiment was then reversed, by pouring 
the water to the acid, instead of the acid to the 
water, in which case the mercury rose from 50° 
to 229°, = an increase of 179° of temperature. 
EXPERIMENT II. 
606.6 grains of the concentrated vitriol were 
poured to 222.8 grains of water (= 1 atom oil of 
vitriol + 2 water.) The mercury rose from 51° 
to 261°, = an increase of 210° of temperature. 
The experiment being reversed, the mer- 
cury rose from 51° to 262°, = an increase of 211° 
of temperature. 
EXPERIMENT III. 
502.7 grains of the concentrated vitriol were 
poured to 276.9 grains of water(= 1 atom oil of 
