T 2 jtfr. C AV ALLOTS Account of 
fhall briefly relate feme obfefvatious made on the cold produced 
by the evaporation of other fluids bdi-des. ether. 
In a room, the temperature of which was 64* according to 
F ahrenheit’s thermometer, and in which the am was gently 
ventilated, I obferved the efFeas produced by various fluids 
when thrown upon the tkill of a thermometer- The ball ot 
this thermometer was quite detached from the ivory piece upon 
which the fcale was engraved. The various fluids were thrown 
upon the thermometer through the capillary aperture of a 
fmall dial's veffel,. lhaped like a funnel, and care was taken to 
throwihem fo (lowly upon the bulb of the thermometer, that 
a drop might now and then fall from the under part of it ; ex- 
cept when thole fluid's were ufed, which evaporate very (lowly, 
in which cafe it was Efficient to keep the ball of the thermo- 
meter only moift, without any drop felling from it. During 
the experiment the thermometer was kept turning very gently 
round its axis, in order that the fluid ufed might fell upoa every 
part of its bulb. This method I find to anfwer much better 
than that of dipping the ball of the thermometer into the fluid 
and removing it immediately after, or that of wetting the ther- 
mometer with a feather. The evaporation, and coniequently 
the cold produced by it, may be increafed by ventilation. vm. 
by blowing with a pair of bellows upon the thermometer t. but 
this was not ufed in the following experiments, beeaufe it is 
not eafily performed by one perfon, and aifo beeaufe it occafions 
very uncertain refults- , 
With the above deferibed method I began to examine the 
effe&s of water, and found, that the thermometer was brought 
down to 56°, viz. 8° below the temperature of the room m 
which the experiment was made, and of the water employe . 
