Mr. nairne on Ice of Sea Water . 
At fourteen minutes after eight in the morning of Ja- 
nuary 31,1 put the jar b of the fecond table, containing 
the fame water ; viz. a mixture of rain and fnow water, 
in a window, having the evening before placed a feconcj 
thermometer in it, tne bulb of which was juft below the 
fur 1 ace of the water. This as well as the thermometer at the 
bottom flood at 27.5, and the water was perfectly fluid:: 
the thermometer placed near the jar within the window 
was at 23.5. At twenty-feven minutes after eight it be- 
gan to freeze at the bottom of the jar, the thermometers 
at the top and bottom Handing alike at 2 7 . The inflant 
the cryftals began to encompafs the ball of the thermo- 
meter below, which they very foon did after it began to 
freeze, the quickfilver rofe in it to 32 0 , the upper one 
continuing at 27 0 . The cryftals continued to fhoot up- 
ward, and in lefs than half a minute reached the bulb of 
the thermometer at the iurface, which immediately rofe: 
tO 3 2°. 
At ten minutes before fix in the evening of the fame 
day, I put the jar a of the fecond table into the open air, 
its contents the fame ; viz. fea water. The thermome- 
ters in it were likewife the fame, not having been moved’;, 
they both flood at 34 0 ; that in the open air at 19.5. At 
fix o’clock the thermometer above was at 3 1 °, that below 
at 28.25. At this time I difcovered lorne ice on the fur- 
face of the water; but as it was by candle-light, I could 
not difcern its firft appearance. At ten minutes after fix, 
/ 1 
the thermometer above was at 29 0 ; that below at 26.5. 
At fifteen minutes after fix, the upper thermometer at 
5 • 2,8.5 ; ; 
