SULPHURIC ACID FOR WATER. 375 
was also put 100 grains of the acid, sp. gr. 1.135; 
this was gently heated upon a sand bath, until the 
100 grains were reduced to 31.9 grains, by the 
evaporation of 68.1 grains of water. It was then 
placed, along with a vessel of concentrated acid, 
under an exhausted receiver, upon a brass trans- 
fer plate, and left in the immediate neighbour- 
hood of the other dish. 
The losses of weight from the two dishes were 
found to be as follows :— 
Range of Temperature to 
which the objects of experi- 
ment were exposed between 
the present and next previous 
Total loss from | Total loss from 
the dish under] the dish under 
the unexhaust-| the exhausted 
ed receiver. receiver. 
1838. 
weighing. 
Grains. Grains. 
January 19 0.8 A From 28° to 32° 
3 20 0.9 7.0 a IQTtora 
“A 21 1.0 pe ice ees tO 124, 
“A 22 1.4 8.0 » 43 to 44 
9 23 1.7 8.1 AP Saute) on 
ss 28 2.6 8.6 sat a0 to, de 
“ 31 3.1 8.6 5» o2 to 34 
February 3 3.5 8.6 SUR SontOuot 
e 7 4.0 Ss poe ttOwSe: 
As 10 8.6 3. 32 tor3s 
On the 28th January, the acid under the ex- 
hausted receiver was in a perfectly crystallized 
state : after weighing, a little warmth was applied 
to the dish, by which the acid immediately be- 
came fluid, without undergoing any appreciable 
