[ 6 5 6 J 
fyrttaw, in Hungary, obfervations there on the emerfion of 7J.’s firlt fatellite, p. 185, 
186. The emerfion of 'IJ.’s fecond fatellite, p. 188. The emerfion of %’j third 
fatellite, p. 19 1. «. 
u. 
Urallian mountains, feme account of them, p. 528. 
Urine, its faline nature inftantly makes black blood red, p. 246. An account of a 
fuppreffion of urine cured by a punflure made in the bladder through the anus, 
p. ^58. Diflreffed condition of the patient, p, 578 — 580. A difeharge of the urine 
by a punflure into the bladder by the anus propofed, p. 580, 581. The operation 
performed, p. 582. Progrefs of the cure, p. 582 — 584. Some account of a like 
operation, p. 585. Calomel and opium the belt internal remedy for fupprefiions of 
urine, p. 585, 586. 
V. 
Van Helmont, his opinion concerning air in the blood, p. 228, 229. 
Variation- ccnpafs, belonging to the Royal Society, concerning it, p. 383 — 395, Ob- 
fervations made with it, p. 302, 393# 
Vegetation, a furprizing fpecies of, in Falkland Iflands, p. 105. 
Velocity, giving different degrees of to heavy bodies from a Hate of reft, in experi- 
mental examination of the quantity and proportion of mechanic power neccffary 
to be employed in, p. 450. See Mechanic Power. 
Vergiji-boll, Hottentots ufe its juice to poifon their arrows, p. 277. 
VieuJJ'enius, his opinion concerning air in the blood, p. 229. 
Vinegar , not fo ferviceable in purifying a fhip as fire and finoke, p. 404. 406. 
Vitriol, acids of, and of fea-falt, experiments to fee how far they contribute to mine- 
ralize metallic and other fubftances, p. 603. See Mineral Subjlances. 
Voyage round the world, the method taken for preferving the health of the crew of 
his majelty’s fhip the Refolution during it, p. 402. See Health. 
W. 
Water obtained from the melted ice of fea-water, perfeflly free from any tafte of 
fait, p.250. Its gravity with relpett to other waters, p. 25 r. Frelh water very 
fcarce in fomc places in the fouthern part of Africa, p. 300. 305.307, 308.312. 
316. An experiment of parting frclh-water from falt-vvater by freezing, p. 373, 
374. Remarks thereon, p. 374. Frelh water produced from ice taken from the 
fea, ibid. Frelli-water and cleanlinefs will prevent the feurvy amongft feamen^ 
p. 405. 
Wa'verton , an enumeration of its inhabitants in the year 1774, p. 166. Chrifteninga 
and burials, ibid. Great increafe of inhabitants there, p, 165 — 167. 
Wax, 
