Experiments on the freezing of Acids, 1 73 
might naturally fuppofe, that this was the true freezing point 
of the unfrozen acid. But yet, from what has been juft faid, 
it feems not improbable that it may be otherwife, and that 
the true freezing point may be fenfibly lower ; for which 
reafon it is marked in the table with an aiierilk (*) as doubtful. 
It was before faid, that the temperatures in the ninth column 
of the foregoing table, are the freezing points anfwering to the 
ftrengths expreffed in the third column, and that - 41°! is the 
freezing point anfwering to the ftrength of ,561 ; whence 
the freezing points determined by thefe experiments, and their, 
refpedtive ftrengths, are as follows : 
Strength. 
Freezing point. 
>561 
O 
-41,6 
?445 
- 3> 8 
>39° 
- 4 
> 353 
— 1 1 
j 343 
- »3’ 8 
?3 10 
“ 2 3 
,276 
-40,3 
By interpolation from thefe data , according to Newton’s 
method f, it appears, that the ftrength at which the acid 
freezes with the leaf!: cold is ,418, and that the freezing point 
anfwering to that flrength is - 2%*-. 
In order to {hew more readily the freezing point anfwering 
to any given ftrength, I have computed, by the fame method, 
the following table, in which the ftrengths increafe in arith- 
metical progreffon. 
f Frincip, Math, Lib, III. prop, 40, lem, 5, 
Strength, 
l 
