Bis Thermometer with the common mercurial ones. ‘BR 
up, that the flow draining off of the water was now fufficiently 
accounted for, and indeed this draining was the only apparent 
mark of any paflage at-all. On taking the ice out of the fun- 
nel, and breaking it to examine this canal, I found it almoft 
entirely filled up with ice projeting from the folid mafs in cry- 
ftalline forms, fimilar in appearance to the cryftals we often 
meet with itt the cavities of flints and quarzofe fiones. 
If, after all thefe circumftances, any doubt could have re- 
mained of the ice in queftion being a new production, a fa& 
which I now obferved muft have removed all fufpicion. I 
found a coating of ice, of confiderable extent and perfectly 
tran{parerit, about a tenth of an inch in thicknefs, upon the 
-outfide of the funnel, and on a part of it which was not in 
conta& with the furrounding ice, for that was melted to the 
diftance ef an inch from it. 3 
- Some of the ice being fcraped off from the infide of the 
linia, and applied to the bulb of the thermometer, the mer- 
cury funk from 50° to 32°, and continued at that point till the 
ice was melted; after which, the water being poured off, it 
rofe in a little time to 47°. 
Aftonifhed at thefe appearances, of the water freezing after 
it had been melted, though {Grrounded with ice in a melting 
ftate, and in an atmofphere about 50°, where _no part of the 
apparatus or materials could be fuppofed to be lower than the 
freezing point, I fufpected at frit that fome of the falt of the 
freezing mixture might have got into the water, and that this, 
in diffolving, might perhaps abforb, trom the parts contiguous. 
to it, a greater proportion of heat than the ice of pure water 
does. But the water betrayed nothing faline to the tafte, and 
Thad applied the freezing mixture with my own hands with 
great care, to prevent any of it being mixed with the water. 
ear TXXIV. Ddd 3 berg a 
