284 Z)r. Blagden’s Experiments on 
proportions were 8 : 1, I cooled it to 2 4 0 , about two degrees 
below its freezing point, and then, no fait being depofited, I 
put into it a fmall bit of ice. The eftefl of this was not in- 
ftantaneous, as in pure water, though ultimately the fame ; 
the bit of ice gradually enlarged, and when it was ftirred 
about in the liquor, a number of ftar-like cryftals formed, 
which being fcattered through it foon brought it to an uniform 
temperature of 26°. This fame folution, when cooled in a 
preceding experiment to 18 0 , had its freezing point at 2 7 0 , 
from the quantity of nitre that had been depofited. I11 all 
folutions, therefore, of fuch falts as are much more foluble in 
hot than in cold water, if it be defired to find their freezing 
point when they are loaded with as much of the fait as the 
water can contain at that temperature, the moft effectual me- 
thod is to oblige them to (hoot, as foon as they can be made to 
do fo, by putting in a fmall bit of ice or l'now ; for thus the 
fallacy which might otherwife arife from the deposition of 
lome of the fait will be avoided. 
A doubt having been fuggefted, whether the contact of a 
cryftal of fait might not alfo bring on the congelation, that 
experiment was tried, but it produced no effect. Indeed, the 
formation of faline cryftals in thefe experiments, the liquor 
ftill remaining fluid, was a fufficient proof to the contrary. 
There is another phenomenon which I thought took place in 
folutions of nitre and fome other falts, but could not abfolutely 
fatisfy myfelf concerning it; namely, that the depofition of 
fome fait baftened that of the remainder. For inftance, fup- 
pofe that a folution of nitre in the proportion of 1:8, would 
retain the whole of its fait at its freezing point of 26°; then, 
if another folution were made much ftronger, it w T ould begin 
to depofit its fait before it came to 26°; and when cooled to 
26°, 
