178" Mr. hutchins 's Account, Sec. 
moment of congelation, or even afterwards; for the 
quickfilver in the tube flill continues to fall, and hath the 
fame appearance as before, contrary to what we obferve 
in water. I think, therefore, it can only be determined 
by breaking the glaffes at different altitudes ; but this 
would be both tedious and expenfive. However, were 
fpare tubes filled by the maker, and graduated by the 
operator, to be made ufe of, the expence would be lefs ; 
but then, if thofe tubes will not admit of being gra- 
duated to a confiderable difiance (luppofe iooo 0 ) below 
o, the operator is obliged to put a thermometer, with a 
fcale graduated by the inftrument-maker, together with 
the other tube, into the mixture, to learn the degree of 
cold after the quickfilver in the fpare tube, defigned 
chiefly for the experiment, hath fubfided into the bulb, 
as was my cafe. Profeffor braum made it fubfide even to 
1500°, which fhews the finenefs of the tubes he made 
ufe of. 
Thcfe, sir, are all the obfervations that much bufi- 
nefs, and an infirm llate of health, permit me at this 
time to tranfmit to you. I wifh they were more worthy 
your attention. You are the beft judge whether they 
will bear the infpe&ion of the Royal Society, and to your 
candour I fubmit them. I propofe making fome more 
experiments this year, which I fliall take a pleafure in 
communicating; being, with great regard, Sec. 
Obfcr- 
