[ *°9 3 
Equation, cubic. Appendix to a paper, intitled, a method of extending Cardan’s rule 
for refolving one cafe of the cubic equation, x^—qx—r, to the other cafe of the fame 
equation, which it is not direCtly fitted to folve, and which is therefore called the ir- 
reducible cafe, p. 85. See Cardan , 
Equations . Improvements of fome known properties of, and difcovery of others, p. 
287. Way of aligning the roots of, by infinite feries, p. 415. 
Evaporation . What is called the cooling procefs depends upon principles different 
from, p. 469. 
F. 
Ferrous Scipio. Conjecture of the method by which he difcovered Cardan’s rules. See 
Cardan, 
Fire, The culinary and electrical, have different effeCts on iron and copper, p. 337. 
Fijlula Lachrymalis, New method of treating the, p. 239. Common methods of avoid- 
ing the operation for the, p.^41. 
Foetus, The fmall -pox communicated to one, by the mother, p. 128. Mr. Hunter’s • 
reflections on this cafe, p. 131. 
Fogs, Confirmation of Mr. Ronayne’s experiment of their eleCtricity, p. 26, 
Fordyce , Dr. His new method of aflaying copper ores, p. 31. 
Fradlions. Theorems ufeful in deriving the logarithms of great fractions from thofe of 
Imall ones, p. 308. 312. 
Frogs, Experiments on, with the poifon ofTicunas, p. 188. 203.' 
Froft, How it contributes to purify the atmofphere, p. 362. 376. Obfervations and 
experiments on the comparative temperature of hoar-froft, and the air near i t 9 , 
p.451. See Cold . 
Gibraltar, Its healthinefs, p. 3 7 7; 
Giants Caufevoays, Suppofed to be the nuclei of Volcanic mountains-, whofe lighter and 
lefs folid parts may have been worn away by the hand of time, p. 48. 
Glafgovo . Extraordinary cold at, in January 1780, p. 451. 
Gold leaves diffolved by an animal acid, p. 127. 
Grant , Mr. Account of Mrs. Ford’s cafe, p. 131. 
Guinea-pigs, Experiments on, with- the poifon of Ticunas, p, 170* 174. 179. iSr* 
See FicunaSi 
FLarmattatiSy 
