INDEX. 
Delaval^ Edward, efquire, his experiments and obfer- 
vations on the agreement between the fpecific gravities 
of the feveral metals, and their colours when united to 
glafs, p. lo. 
Dollond^ Mr. Peter, ^QQTelef copes. 
E. 
Earth-quake^ that at Lifbon, December 26, 1764, p. 43. 
A method to know the ftrength and diredion of it, 44. 
Edwards, Mr. his defeription of a beautiful Chinefe 
pheafant, p. 88. 
Ellis, John, efquire, his letter on the nature and for- 
mation of fponges, p. 280. 
Ergot, fee Rye. 
Evaporation, Differtation on the nature of it, p. 146. 
Performed by folution, 149. This principle accounts 
for feveral phasnomena of the atmofphere, 1 60. Of 
refpiration, 172. Of fire, 174. 
Exhalations, the knowledge of them applied to mineral 
waters, p. 236. 
F. 
Fergufon, James, his methods to find the quantity of 
tim.e, in any given number of mean lunations ; the 
number of troy pounds in any given number of avoir- 
dupoife pounds, &c. p. 61. 
Fire, how fed by air, p. 1 74. 
Franklin, Benjamin, L L. D. his phyfical and meteoro^ 
logical obfervations, chiefly concerning air, p. 182. 
G. 
Gale, Dr. Benjamin, his memoirs concerning the pradice 
of inoculation for the fmal 1 -pox, in the BritilE Ameri- 
can provinces, p. 193. His letter concerning the fuc- 
cefsful application of fait to wounds made by the biting 
of rattle-fnakes, p. 244. 
y y 2 
Cold, 
