on Mr. Hutchins’s Experiments. 
what degiee it flood at- Thefe experiments agree with the 
foimei in file wing the freezing point to be —40° on the two 
mercunal thermometers; and alfo (hew what degree on the 
fpirit theimometers anfwers thereto, namely, 29°! or 28 \ 011 
D, and 30° on E ; for in thefe two experiments the fpirit ther- 
mometers alfo were dipped into the frozen quickfilver. 
In all the experiments, therefore, tried with the thermome- 
ter G, the freezing point came out - 40k In thole tried with 
h , it came out either - 40°, or about — 40°^ ; l'o that as it 
appears, from A 4 r. Hutchins’s table of companion, that F 
flood at a medium a quarter of a degree lower than G, the ex- 
periments made with that thermometer alfo Ihew the freezing 
point to be - 40° on G ; and as it appeared from the examination 
ol this thermometer after it came home, that —40° thereon an- 
fwers to -38 on a thermometer adjusted in the manner re- 
commended by the Committee of the Royal Society, it follows, 
that all the experiments agree in fhewing that the true point at 
which quickfilver freezes is 38°*, or in whole numbers 39® 
below nothing. 
From what has been faid it appears, that the point at which 
quickfilver freezes has been determined by Mr. hutchins in 
different ways, all perfectly fatisfadlory, and all agreeing in 
the fame refult. In the three fuff experiments the thermome- 
ter was furrounded by quickfilver, which continued freezing 
till it became folid. In the lixth experiment the quickfilver 
with which it was furrounded continued flowly melting till the 
whole was diflolved ; and in both cafes the thermometer re* 
mained flationary all the while at what we have juft faid to be 
the freezing point. In the ninth and tenth experiments, the 
ball of the thermometer was dipped into quickfilver, previoufly 
frozen and beginning to melt, as ufually pradlifed in fettling the 
U u 2 freezing 
