t 5 00 ] • 
Spermaceti whale. See Atnhergrife. The mu;. n.n tneir conftant food, p.236. Marks by 
which it is diftinguilhed, p. 241. Spermaceti not the brain of the fifh, ibid. 
Stars. See Sun and Solar Syjiem. 
Steel. See Lightning. 
Sun and Solar Syjiem. On the proper motion of, with an account of feveral changes that have 
happened among the fixed liars fince the time of Mr. Flamftead, by William Herfchel, 
Efi]. p. 247. Reafons for fufpedling there is not one fixed liar in the heavens, p. 248. 
See p. 25 9. Short account of the changes in the heavens fince Mr. Flamftead’s time, p. 
249. Account of Mr. Herfchel’s three reviews, and the inftruments he ufed, ibid. 
Convenient apparatus of his telefcope, with the particularities he attended to in his 
laft review, p. 250. Changes obferved fince Flamllead’s time, viz. I. Stars lofi, or 
which have undergone forne capital change, ibid. In Hercules, p. 251. 255. In Can- 
cer, ibid. 252. In Perfeus, p. 251. in Pi fees, p. 252. In Hydra, ibid. In Orion, 
ibid. In Coma; Berenices, 253. In Draco, ibid. II. Stars that have changed their 
magnitude, p. 254. In Draco, ibid. In Cetus, ibid. In Serpens, ibid, in Cygnus, 
ibid. In Urfa Minor, ibid. In Bootes, ibid. In Delphinus, ibid. In Triangulus, 
ibid. In Aquila, ibid. In Sagittarius, p. 255. In Canus Major, ibid. In Serpens, 
ibid. In Equuieius, ibid. In Delphinus, ibid. In Bootes, ibid. In Sagitta, ibid. 
In Urfa Major, ibid. In Hydra, ibid. In Lyra, p. 256. In Draco, ibid. In Cancer, 
ibid. In Taurus, ibid. In Aries, ibid. In Lynx, ibid. In Monoceros, ibid. In 
Gemini, ibid. In Orion, p. 257. In Leo, ibid. III. Stars newly become vifible, 
p.257. Near Laarta’s tail-end, ibid. In Perfeus, ibid. Near the head of Cepheus, 
ibid. In Gemini, ibid. In Equuieius, 258. In Sextans, ibid. Between Cancer 
and Hydra, ibid. In Hercules, ibid. In Bootes, ibid. Not eafy to prove ftars to 
be newly come, ibid. Probable reafons for fuppofing every ftar to be more or lefs in 
motion, p. 259. The proper method of detecting the direction and quantity of the 
fuppofed proper motion of the fun, by a few geometrical dedu£tions, pointed out, p. 
260. Probable tendency of the courfe of the folar fyftem, fhewn, ibid. Fig. 1. and 
2. explained, p. 260, 261. Double ftars on which to make obfervations for afeertain- 
ing fmall relative motions among the fixed ftars, 263. Deviations of the planets from 
the law which all other ftars feem to obey, explained, p. 267. Fig. 3. explained, 
ibid. M. de la Lande’s table of the proper motion of twelve ftars, both in right af- 
cenfion and declination, p. 270. Fig. 4. explained, ibid. Striking circumftances in 
the quantities of the motions of the above ftars, p. 271. et feq. Poftfcript, concern- 
ing Mr. Tob. Mayer’s comparifon of the place of So ftars obferved by him in 1756, 
with the fame ftars as given by Roemer in 1706, p. 274, et feq. Remarks on Mr. 
Michell’s admirable idea of the ftars being collected into fyftems, p. 276. Table of 
the ftars which agree with Mr. Herfchel’s aftigned motion of the folar fyftem, p. 277. 
and of thofe whofe motions cannot be accounted for by his hypothefi p. 278. and 
temarks thereon, ibid, et feq. Fig. 5. explained, p. 279. A paragraph of Mayer’s, 
which fee in s to contain a ftrong objection again ft the motion of the folar fyftem, but 
may 
2 
