Fm Martin, Account of the, p. 279 — .285. TurpofesTor which they are preferved, 
p. 285. Their refemblance to oxen, p. 285, 2S6. The fiuppofed excellence of 
their meat not a property of them univerfaily, p. a. 36 . Dubious whether there are 
any among fheep, p. 287. Account of Mr. Arbuthnot’s, p. 289. Mr. Arbuthnot’s 
more deferviug of the name of hermaphrodite than the two following, p. 290. Ac- 
count of Mr. Wright’s, ibid. Of Mr. Wells’s, p. 292. 
Frog . Analogy of the organ of voice of the OrangOutang with that of frogs, p. 156. 
Froji. Ruffian method of reftoring circulation in a frozen limb, by means of friction 
with fnovv, p. 330. 
G. 
% 
Galen, ExaCt nefs of almoft all his defcriptions of the Cynocephalus, p.141. Pro- 
bable that he diffe&ed an Afiatic Orang, p. 148. Vermicular procefs in the intef- 
tinum coecum of feveral fpecies of Orangs, unknown to him, ibid. Comparifon 
of the organs of voice of the Prince of Orange’s celebrated Orang, with Galen's 
defcriptions, p. 134. 
Gafs, Eafy method of producing a fufficient quantity of, without trouble or any parti- 
cular apparatus, p. 380. Produced by fixing equal quantities of oil of vitriol and 
fpirit of wine, and applying heat to the phial containing the compound, ibid. 
Advantages of this laft gafs above others, p. 381. Specific quantities of the dif- 
ferent gaffes examined, p. 382. One made of vitriolic cether, p. 384. Its properties, 
p. 386. And differences from the other inflammable air, ibid. Experiment to 
prove it fpecifically heavier than common air, p. 387. Cautions about firing the 
piftol to make it, p. 390. Why it cannot exert the force of a wind gun, p. 399. 
Experiment to {hew that its compound with common air is much reduced in bulk 
after inflammation, p. 400. Great explofion of very dephlogiflicated air and aether 
air, p. 407. See more under Air, 
Generation, What caufes the perfection of, p. 279. 
Geometry . Horizontal Ifochronic curve deferibed, p. 583. 
Glafsi In which there is much alkaline fait, lefs fit for electricity than others, p. 665. 
Long expofed to heat, fuperior in ftrength for eleCtrical purpofes to a cake of rofin, 
ufed in the eledrophorus, p. 666. Difks made with it mult not be dried by the 
fire, ibid. 
Gold and filver, found in their metallic form, mixed in a large proportion in an ore 
from Norway, p. 531* 
Gold Pyrites examined, p. 528. And found feldom to contain gold, p. 528. Expe- 
riments on a piece of gold ore, which turned out to be gold in its native form, and 
not mineralized, p. 531. 
Vol. LX IX. * 4 U 
Grenades * 
