[ 454 ] 
EXPERIMENT III. 
Not content with this laft difcovery, I removed the 
Tourmalin and Therm, into the open air. In about 
three minutes, the Therm, having fallen from 42 to 3 9, 
the Tourmalin was eledrified again, in the fame man- 
ner as in the lad experiment. But when the eledric 
figns difappeared, the Tourmalin and the air were 
in this cafe alio of an equal temper: at which time 
the Therm, had fallen to 34. The (lone was con- 
tinued in the open air for half an hour or more, but 
no further eledric figns appeared. 
0 
EXPERIMENT IV. 
On returning into the room where the firft experiment 
was made, the eledric figns were Wronger than in any 
of the preceding trials, and contrary to the two laft } 
for the convex fide was minus , and the plain fide plus t 
which agrees with the appearances in the firft ex- 
periment. 
EXPERIMENT V. 
When the Therm, fhewed the ftate of the out- 
ward air to be confiderably lefs warm, than what an- 
fwers to the degree at which water is fixed, the fame 
changes happened, by carrying the Tourmalin from 
it, into a room, where the Quickfilver ftood at 34: 
and afterwards, from thence, back again into'the open 
air. 
Sir 
