' APPENDIX. 313 
with acrid Fumes : Which Fumes were fo 
“ warm that they raifed the Thermometer, 
which hung over them, ten Degrees ; 
while at the fame time another Thermo- 
“ meter which was placed in the Mixture, 
defeended by reafon of the increafed Cold 
” from fixty to forty eight Degrees ; the 
greateft part of the Salt was dilTolved. If 
while the Effervefcence continues, fome 
Water be poured in, the Thermometer, 
which was in a defeending State on ac- 
count of the increafing Cold, will imme- 
diately afeend on account of the then much 
increafed Heat. 
77. He repeated this remarkable Expe- 
“ riment in vacuo in the following manner, 
“ viz. He fufpended in the Receiver one 
“ Thermometer, fo as to be above the Froth 
of the efFervefeent Mixture four or five 
Lines of an Inch ; the other Thermometer 
he put into the Vellel in which v/as a 
Dram of Sal Ammoniac^ fufpending over 
it in a moveable Viol, three Drams of 
Oil of Vitriol; then having drawn the 
Air carefully out of the Receiver, he let 
all ftand thus for an Hour, that they might 
have an equal Heat 5 after which on pour- 
ing 
