A N 
ACCOUNT 
OF SOME 
THERMOMETRIC AL EXPERIMENTS; 
CONTAINING, 
I. Experiments relating to the cold produced by the evaporation 
of various fluids* with a method of purifying ether, 
II. Experiments relating to the expanfion of mercury, 
HI. Defcription of a thermometrical barometer. 
By TIBERIUS CAVALLO, R R. S. 
Who was nominated by the Prefident and Council to profecute 
Difcoveries in Natural Hiftory, purfuant to the Will of the late 
h£nry baker, Efq. F. R. S. 
Read at the ROYAL SOCIETY, June 28, 178^ 
