[ 1098 ] 
tufFa at Andernach, p. It produces a confiderable trade between this town and 
Holland, p. 6. The tuffas of Naples fuppofed to be compofed of n puzzolane, pre- 
pared by volcanicfire, ibid. 
Vol. Sal Ammoniac, its effedt upon air, p. 208. 
. Volatile alcali, the mod: ufeful to obviate bad fmells, p. 209. 
Volcanos , feveral in the ifland of Sumatra, p. 163, 164. 
. Volta, Mr. concerning his Eledtrophorus, p, 1027. See Eleftrophorus . 
Voyage to the Eaft Indies, in the year 1775, a journal of it, p. 389—416. See Tables * 
W. 
'tV ales, Mr. William, his obfervations on the folar eclipfe June 24, 1778, p. 1013— 
1018. 
Walnut-tree, experiments on one, refpedling its temperature comparatively with that 
of the atmofphere, p. 41 — 48. 
Wallis , Dr. his opinion concerning the communicating of motion to bodies, p. 346. 
Watch-making. Account of a very ufeful machine for determining the perfedl propor- 
tion between different moveables adting by levers, and wheel, and pinion, p. 950 
—998. 
Plater. Stagnant water frequently the caufe of difeafe, p. 131 — 132. Experiments 
on the purenefs of the air over waters, p. 211. Water corredts and purifies air 
rendered noxious by refpiration and putrefadlion, p. 141. An account of the mi- 
neral waters in the ifland of St, Miguel, p. 605 — 608. 
Wat/on , Dr. Richard, his chemical experiments and obfervations on lead ore, p. S63* 
See Lead Ore. 
Wat/on , Dr. William, his account of a blue-fhark, p. 789, 790. 
Wattle and comb of a cock frozen, with a view to fee if they would be reflored to the 
adtions of life when thawed, p, 36. 
Weather. State of it at Fort St. George, in the Eaft Indies, during the months of Odlo- 
ber, November, and December, in the year 1776, p. 182 — 188. And for January 
and February, 1 777, p. 188 — 192. State of it before the earthquake of 1749, l 75 °> 
p.228. State of it before the earthquake at Manchefler, &c. 1777, p. 228 — 231. 
Obfervations on the weather, &c. during the year 1777, at Lyndon in Rutland, p. 
555, 556. An account of the weather there in the year 1725, p. 556, 557. Remark 
thereon, p. 557, 358. Journal of the weather at Montreal, p. 559. Dr. Saunders’s 
letter concerning it, ibid. State of the weather for December, 1776, p. 560. For 
January, 1777, P* 561. For February 177 7, p.562. For March, 1777, P* 5 ^ 3 * 
Weather for the year 1777, at Briftol, p.768 — 570. State of the weather in Lon- 
^don for e^ch month throughout the year, 1777^.574 — 597, 
meet 
