254 Mr. Cavendish’s Account of fame 
in N° 27. the fluid part was in all probability not fenfibly 
ftronger than the whole mafs; for as N° 27, was cooled only 
feven degrees below the freezing point, and its temperature 
was tried foon after its beginning to freeze, not much of the 
acid could have frozen ; whereas the other was cooled 1 5 degrees 
below its freezing point, and was expofed for an hour or two 
to an air not* much lefs cold, in confequence of which a con- 
fiderable part of the acid muft have frozen ; fo that in all pro- 
bability the acid, whofe freezing point was found to be 30% 
was in reality ^ part ftronger than that whofe freezing point 
was - 1 9 0 . 
If this reafoning be juft, the freezing point of thefe acids is 
as follows.: 
Freezing 
point. 
Dephlogifticated fpirit of nitre, whofe ftrength = | 
Common fpirit of nitre, whofe ftrength ~ | 
> 5 6 
>53 
>437 
>54 
. > 4 n 
" 3 °° 
-19 
- 4 i 
- 3 U 
- U 
On the Phenomena objerved on mixing Snow with thefe Acids . 
1 2. On Dec. 13, fnow was added to the fpirit of nitre N° 
168, as recommended in Art. 2. The fnow was put in very 
gradually, and time was taken to find what effect each addition 
had on the thermometer and mixture, before more was added. 
The temperature of the acid before the mixture was - 27 0 , and 
each addition of fnow raifed the thermometer a little, till it 
rofe to — i° J ; after which the next addition made it fink to — 2 0 , 
which fhewed that fufficient fnow had then been added. The 
quantity 
