[ 6 49 ] 
the fame, ibid. By a third mixture of the fame to 430°, and that in a fpare tube, 
which admitted only ot 250° below o, funk into the bulb, p. 175, 176. Quickfilver 
frozen, p. 176. A fecond attempt, the mixture having a greater degree of cold in it, 
and the thermometer at 2S 0 below o, p. 177. Quickfilver in a fpare tube which ad- 
mitted only of 200° below o fubfided into the bulb, and in the ftandard thcrmoter 
to 447 0 , ibid. Placed in a fecond and third mixture of the fame, but the bulb cf 
inllrument being cracked, the quickfilver by degrees reached the point of boiling 
water, ibid. Remarks on the freezing of quickfilver, p. 177, 178. Silver and 
quickfilver the only fubllances which are mineralized by the acid of fait, combined 
with acid of vitriol, p. £23. 
R. 
Rain, obfervations on the quantity which fell in London during one year, commencing 
with March 1735, p. 355. More than two thirds of the rain of the whole year given 
by the S. W. wind, p. 359. Quantities of rain which fell feverally with each wind 
in every month and in the whole year, p. 360. A general view of the rain in the 
months of January and February 1775, 365. A general date of the rain for twelve 
months, beginning with March 1775, ibid. Quarterly, half-yearly, and year’s rain, 
p. 366 — What quantity of rain fell at Briftol in the year 1773, p. 368.— At Lyndon, 
in Rutland, p. 370. Comparative view' of what came in the years 1740, 4 1 # 4 Z > 2nd 
43, and in the years 1772, 73, 74, and 75. p. 371. The proportion that the mean 
months bear to the whole years at feveral periods there, with refpeft to rain, ibid. 
Rain-gage , belonging do the Royal Society, conceining it, p. 385. 
Ree Bock, a fort of antelope, in the fouthern part of Africa, p. 270. 
ReeJs, weaved by the Hottentots into bafkets that will hold liquor, p. 294. 
Re/olution, one of his majefly’s fhips, method taken for preferving the health of the crew, 
during her late voyage round the world, p. 402. See Health . An account of fome 
of them being difordered by eating fifh of a poifonous nature, p. £44 55 2, 
Refpiration, obfervations on, and the ufe of the blood, p. 226. Breathing air which has 
’ been frequently refpired, as fatal as a total deprivation of air, p 226. 230. 233. 
Refpiration a phlogijlic procefs, p. 226, 227. 238. Cfe of the lungs, p. 227-— 237. 
Opinions of the ancients and moderns concerning the ufe of refpiration, p. 228—237. 
The right ufe of refpiration has never been fo much as conjeftured, p. 237. 
Rhinocerofes, the largeft ihare of true remains of, where found, p. 528. 
Rielecks Cajleel, a mountain in the fouthern part of Africa, fome account of it, p. 
furfaces, and folids, propofitions felefted from a paper on the divider of, 
p. 73. See Propojitions. 
Rob. See Lemons , and Oranges, 
Robin/on (Bryan), his opinion concerning air in the blood, p. 229. 
. ' 1 r , r n ,^o 271. 27C. An infinite number of frag* 
Rocks in the fouthern part of Africa, p. 270, 271. 
ments of rocks there, p. 273. 281, 2 % 2 ’ *° 9 ‘ 3 ° 9 » 3 10, 3 I3t 
Roebuck 
