fomc Thermomefncdl Experiments. 5 1 3 
This effect was produced in about two minutes time, after 
which a larger continuation did not bring the mercury lower. 
By means of fpirit of wins- the thermometer was brought 
down to 48°, which is only 16 0 , below the temperature of the 
room, and of the fpirit employed. When the fpirit of wine 
is highly rediified, the cold produced by its evaporation is cer- 
tainly greater than when it is of the common fort ; but the dif- 
ference is not fo great as one, who never tried the experiment, 
might expedh The purer fpirit produces tne effect much 
quicker. 
tiling various other fluids, which were either compounds of 
water and fpiritous fubftances, or pure eflences, I found that 
the cold produced by their evaporation was generally in lome 
intermediate degree between the cold produced by the water and 
that produced by the fpirit of wine. 
Spirit of turpentine brought the thermometer only 3 lower 
than the temperature of the room ; but olive oil and other oils, 
which evaporate either very (lowly or not at all, did not fenfl- 
bly affedt the thermometer- 
Willing to obferve how much electrization could incieafe the 
evaporation of fpirit of wine, and confequently the cold pro- 
duced by it, 1 put the tubq containing the fpirit into an inf- 
lating handle, and conne&ed it with the conductor of an elec- 
trical machine, which was kept in adtion whilft the experiment 
was performed ; by thefe means the thermometer was l 
down to 47 0 . Having tried the three mineral acids I 
that inftead of cooling they heated the thermometer, which efTedl 
I expedted ; fince it is well known, that^thofe acids- attraft 
the water from the atmofphere, and jhat heat is produced 
by the combination of water and any of them, vitri 
olic acid, which was very ftrong and trail (parent, 1 aiied the 
X x x £ thermo- 
