bis Thermometer. with the common mercurial ores. ; aun 
Ina {cale of heat drawn up in this manner, the compara- . 
tive extents of the different departments of this grand and ~ 
univerfal agent are rendered confpicuous at a fingle glance of 
‘the eye. Wertee at once, for inftance, how fmall a portion 
of it is concerned in animal and vegetable life, and in the 
ordinary operations of nature. From freezing to vital heat is 
"barely a five-hundredth part of the fcale; a quantity fo inconfi- 
derable, relatively to the whole, that in the higher flages of 
ignition, ten times as much might be added or taken away, 
without the leaft difference being difcernible in any of the 
appearances from which the intenfity of fire has hitherto been 
judged of. From hence, at the fame time, we may be con- 
vinced of the utility and importance of a phyfical meafure for 
thefe higher degrees of heat, and the utter infufficiency of the 
common means of diferiminating and eftimating their force. 1 3 
have too often found. differences, aftonifhing when confidered 
as a part of this {cale, in the heats of my own kilns and ovens, 
“without being perceivable by the workmen at the time, or till 
the ware was taken out of the kiln. 
SINCE the foregoing experiments, were made, I have feen 
a very curious Memoir by Mefl. Lavorsier and De LA Place, 
containing a method of meafuring heat by the quantity of ice. 
which the heated body is capable of liquefying. ‘The applica- 
tion of this important difcovery, as an intermediate ftandard 
meafure between FAHRENHELT’s thermonfeter and mine, could 
not efeape me, and I immediately fet about preparing an appa- 
ratus, and making the ies neceflary for that pur- 
Cece Sale; 
