306 Dr. Blagden’s Experiments on 
\ 
reduction of the freezing point from 24°$ to 7°!* The freez- 
ing point, fet down in the table, is that to which the liquor 
rofe upon congealing, after having been cooled feveral degrees 
lower; which it is proper to remark, becaufe the ice rofe .two 
or three degrees in thawing. 
* 
The nitrous acid I employed was fmoaking, and had its fpe- 
cihc gravity 1 ,454. It adted on the freezing point according 
to .the following table, which is confer ucted in all refpedfcs like 
the preceding. 
Proportion of 
Freezing 
Freezing 
water to acid. 
po-int by 
1 point by 
experiment. 
calculation. 
x 6,3 : 1 
261 
O 
10:1 
22 - 
2l| 
7,64 : 1 
l8 
l8 
5,06 : 1 
IO§ 
I I 
4,26 : 1 j 
7 
7 
The greateft difference between the calculation and experi- 
ment appears here to be only two-thirds of a degree ; but that 
is more than, I think, can be attributed to inaccuracy. Thefe 
mixtures cooled remarkably well ; that in which the water was 
to the acid as 7,64 : 1 funk down to 6° before it froze. The 
ice heated about a. degree before it was melted. 
Spirit .of fait being a very weak acid, its increafe of ratio 
was not perceptible . within the limits to which I -was confined. 
Muriatic 
