INDEX. 55 i 
Shrimp, very prolific, in comparifon to their bignefs 
p. 288. ° 5 
Since , ancient, their fituation, p. 161, &c. 
Sirius , its parallax probably of one fecond, p. 241. 
Smelts have a vaft number of eggs, p. 285. 
Soal not fo prolific as flounders, p. 288. 
Solar fpots are much higher in proportion than our 
clouds, p. 400. 
Solfa- terra, its fulphurs and falts different from thofe of 
Mount Vefuvius, p.200. 
Spars and cryftals formed in flints, and other bodies for- 
merly in a foft date, p. 59. 
Spars differ from cryftals from a fmall mixture of hete- 
rogeneous parts, 61. 
Spry, Dr. Edward, his account of a locked jaw, and para- 
lyfis cured by electricity, p. 88. 
Stars, their want of an obfervable parallax owing to their 
diftance, p. 234. Difpofed into groupes, probably be- 
long to the fame fyftems, 243 — 249. Single ftars may 
belong to our fyftem, p. 252. 
Steward , Dr. his computation of the parallax of the fun, 
p. 179. Agrees with Mr. Horfley’s, p. 184: 
Stones red hot fhot, from Mount Vefuvius, to the height 
of 200 feet, p. 195. 
Sumatra , known to the ancients only in part, p. 172. 
Sun, to what fyftem of ftars he belongs, p. 251. Proba- 
bly ranks only with the ftars of the fourth magnitude, 
P- 2 55 * 
Sun-dials, how conftru&ed without dialing fcales or lo- 
garithmic computations, p. 389. 
Sun’s parallax 6", 52"', 415, p. 181. 
Swinton, Rev. John, his defcription of a meteor feen at 
Oxford, October 12, 1766, p. 108. Obfervations on 
fwarms of gnats feen at the fame place, 111. Inter- 
pretation of a Phoenician medal, 266. 
T tbajheer. 
