[ io 97 3 
u. 
Vlmaria flowers, the effeft of their effluvia upon air, p. 202, 203. 
Unkle. The court of the palace of the eledlor-palatine of Duffeldorff paved with a lava 
from Unkle, p. 2. Great quantities of bafaltic columns brought from thence, p. 
2, 3. An account of the quarry there, p. 3, 4. 
Urethra , experiments on it, relative to heat and cold, p. 13. Experiments on a living 
and dead penis, p. 13 — 17. 
V. 
Veal , experiments on the effects of its effluvia upon air, p. 200, 201. 
Vegetables. Of the heat, &c. of animals and vegetables, p. 7. Vegetables of every 
country are affe&ed if the feafon be more than ordinarily cold, and fome more than 
others, p. 39. Trees from warmer climates fometimes killed with the cold, p. 39, 
40. Experiments upon vegetables refpe&ing their temperature comparatively with 
that of the atmofphere in different feafons, p. 41 — 48. 
Vegetables , their great ufe in curing the fcurvy, p. 663, Sec. More antifcorbutic in 
their raw date than when boiled, p. 664, Sec. See Scurvy. 
Vegetable effluvia, experiments to difcover their effedls upon air, p. 20 r — 203. 
Velocity. The force of fired gun-powder, and the initial velocities of cannon balls, de- 
termined by experiments ; from which is alfo deduced the relation of the initial ve- 
locity to the weight of the fhot and the quantity of powder, p. 50. See Gunpowder. 
Vefuvius. The lava from Vefuvius and the volcanos near Naples fuppofed to have been 
ufed for paving the great Roman roads, p. 4. 
Vienna , the proportionable number of inhabitants that die there annually, p. 154. 
Villa Franca , a town in the ifland of St. Miguel, fome account of it, p. 603, 604. 
Viper , experiments on one, relative to its heat, p. 25. 27. 
Vijion , concerning its organ, p. 91 — 94. 
Vitriol . The beft fouring for tanners made from the ftrong fpirit of vitriol, p. 125,, 
226. How to prepare it, p. 126. 
Volcanos. Sir William Hamilton’s account of certain traces of volcanos on the banks 
of the Rhine, p. 1. The court of the palace of the ele&or-palatine at Duffeldorff 
paved with a lava brought from Unkle, p. 2. Numberlefs bafaltic columns in the 
walls of the town of Cologne, brought from Unkle, and ufed as pods in the ftreets, 
ibid. The walls of its ancient buildings are of a tuffa refembling that of Naples, 
ibid. Many columns of bafaltes in the walls and ftreets of Bonn, p. 3, 6. The town 
paved with lava, ibid. The (lone ufed here for building, is a hard volcanic tuffa, 
ibid. Wolkenberg, Trackenfelts, and Stromberg, threee of the Seven-bergen, com- 
pofed of volcanic fubffances, ibid. High rocks of lava or tuffa on each fide of the 
Rhine, p. 3, 4^. An account of the quarry at Unkle, p. 4, 5. Vaft quantities of 
tuffa . 
