C 681 J 
places or heights, p.449. Ufes to be derived from this method of examining air, 
p. 452. See Gafs. 
Air-Gun . Account of a brafs one contrived by Mr. Maty of Turin, p. 39 2. And of 
one by Mr. Antony, p. 393. 
Algebra . Problems concerning interpolations, p. 59. On the general refolution of 
algebraic equations, p. 86. 
Allum, Tobacco-pipe clay fitted for the making of it, p. 19. Quantity of, afforded by 
the Porcelane clay from Cornwall, p. 21. How made of feld-fpar, p. 23. And of 
the Labradore ftone, ibid. And of Ihells, p. 24. Obtained from different flates, 
p. 23. 
America . The growth of plants in, not to be eftimated by what we fee in our hot- 
houfes, p. 250. 
A .vv ulus. Obfervation of a luminous, furrounding the difk of the moon, in an eclipfe 
of the fun, fuppofed to be the effect of the lunar atmofphere, p. 106 — 1 1 1. 
Anticonduttor . Account of an anticondu&or, and its advantages in exhibiting electrical 
experiments, p. 434. See Eledricity. 
Antimony. A liver of, from antimony and feveral fpars, p. 19. 
Antiquity. Account of a gun which had remained 200 years in the fea, p. 40. 
Apes . Probable that there is a fpecies of them in Africa, which is not the ancient 
Pithecos, p. 147. See Orang-Outang. 
Aphonia. A concomitant of the St. Vitus’s dance, p. 2. 
Argentum vitreum. See Silver. 
Afs . Foal afs killed to examine the parts of generation, p. 282. 
AJlronomy. Obfervations at Cork in Ireland, p. 163. Obfervations with an aftrono** 
mical clock, p. 167. Latitude of Cork in Ireland, p t 165. 167. 180, 18 1. Longi- 
tude of Cork, p. 167. Latitude and longitude of Cork, fettled from obfervations 
at Cork, and at the Royal Obfervatory, p. 1 79. 
Atmofphere. Colour cccafioned by the refraction of, when a flar is but a few degrees 
above the horizon, rather more than corrected by the refraction of the lens, added 
to the equatorial inftrument, p. 335. 
B. 
Barometer . Obfervations made on it at the coaft of Labradore, p. 632. Some baro- 
metrical experiments in the mines of the Hartz, p. 484. Their agreement with the 
geometrical meafure, p. 491. Why the barometrical meafure for the depth of 
mines is more certain than that for the heighth of mountains, p. 492. State of, at 
London for each month throughout the year 1778, p. 296. Greatefl, lead, and 
mem- 
