[ 217 ] 
Being defiro'us of obferving the effed of this ex- 
traordinary degree of cold upon various faline folu- 
tions, I haftened to my elaboratory, where 1 hap- 
pened to have a great many folutions of lalts corked up 
in quart bottles ; the bottles were not all full, but 
the folutions were perfedly faturatedj the date in 
which I found them is exprefl'ed in the following 
table. 
^Frozen wholly 
Frozen nearly 
Wholly fluid 
Alum 
Green vitriol 
Sea fait 
Cream of Tartar 
Blue vitriol 
Sal gemmae 
Arfenic 
Rochelle fait 
Sal ammoniac 
Corrof, fublimate 
Glauber’s fait genuine 
Volatile alkaline fait 
Borax 
White vitriol, a few 
Fixt alkali per deliq. 
Nitre 
glacial fpicula 
Epfom falts 1 Lyming- 
Glauber falts f ton. 
Thefe experiments agree upon the whole very well 
with thofe of profeffor Braunius, related in the 
Peterfburgh Commentaries for 1763 : for, though his 
faturated folutions of Epfom falts, ^nd of fixt alkali, 
had begun to freeze in a lefs degree of cold, yet it 
is probable that his Epfom falts might have been 
different from thofe manufadfured at Lymington, 
and the folution'of his fixt alkali not fo well faturated 
as that which is made per deliquium. 
During the fame froft, I endeavoured to find out 
the powers, by which different falts, when they are 
diffolved in water, refift congelation. With this 
view I diffolved equal weights of falts, equally dry, 
in equal quantities of water, and expofed the folu- 
VoL. LXL F f tions 
