[ 119 T 
meter was ftationary : in the fecond, it funk a little during 
the fliort time we ftaid in the room : in the third, it funk 
fo fail as to oblige us to determine that only one perlon 
fliould go in at a time : and Mr. banks and Dr. solan- 
DER each found, that his iingle body was fufficient to, 
link the quicklilver very faft, when the room was brought 
nearly to its maximum of heat. 
Thefe experiments, therefore, prove in the cleareft 
manner, that the body has a power of deftroying heat. 
To fpeak juftly on this fubjeft, we mull call it a power of 
deftroying a certain degree of heat communicated with 
a certain quicknefs. Therefore in eftimating the heat 
which we are capable of relifting, it is necelfary to take 
into conlideration not only what degree of heat would 
be communicated to our bodies, if they polfelfed no re- 
lifting power, by the heated body, before the equilibrium 
of heat was eftecfted ; but alfo what time that heat would 
take in pafting from the heated body into our bodies. 
In confequence of this compound limitation of our re- 
lifting power, we bear very different degrees of heat in 
different mediums. The fame perfon who felt no in- 
■ convenience from air heated to 2 1 1 could not bear 
quicklilver at i 20°, and could juft bear rectified fpirit of 
wme at 130°; that is, quicklilver heated to 120"^ fur- 
nilhed, in a given time, more heat for the living powers 
to deftroy, than fpirits heatM to i. 30°, or air to 21 1°^/^. 
And 
{f} Thefe numbers are the refult of feme experiments which were made 
®n the- firft gf February, in a room where the heat, of the' air was 65*. Mr. 
SANKS^ 
