254 Mr. nairne on Ice of Sea Water . 
The following table fhews the refult of fome further 
obfervations on the effeits of cold on the fea-water in the 
jar a of the laft table, which had been thawed in order to 
be now expofed again to the open air. The thermome- 
ters in the jar continued in the fame lituation as before. 
January 30, 1776, A. M. 
1 . 
T ime. 
Therm, at 
the Top. 
Therm, at 
the Bot- 
tom. 
Therm, in 
the open 
Air. 
h ' 
10 32 
34-5 
35-5 
16.5 
10 39 
29 
32 
10 42 
28.5 
3°*5 
10 48 
28 
28 
1 1 1 
27 
24-5 
18.5 
11 1 
27 + 
28.5 
2 J 
11 45 
26.5 
28.5 
19 
Effeds, &c. 
The water fluid. 
Ice began to be formed about the glafs at 
the edge of the water. 
Still continued to have ice only about the 
edge of the water. 
The furface of the water rendered ftagnant 
by the ice. 
The cryftals had almoft readied the bottom. 
During the half minute employed in this 
obfervation, the cryftals reached the bot- 
tom of the jar; the lower thermometer 
rofe almoft inftantaneoufly from 24.5 to 
28 5, and was immediately rendered 
obfcure by the ice. 
The jar was taken in from the open air, 
and the lower thermometer lifted out of 
the ice to a fufficient height for the ob- 
fervation. 
From thefe obfervations it feems that the freezing 
point of fea-water fhould be fixed in Fahrenheit’s fcale 
at 28.5. 
As the water, when it began to freeze in two experi- 
ments, exhibited phenomena different from any I had 
obferved before, it may not be improper to fubjoin an 
account of them. 
At 
