| {- sao J 7 
Alg:!, Obf-rvations on the Obfcuration of that Star, by Palitch, a farmer, in a letter 
from the Count de Brubl, p. 4. Times of the greateft obfcuration, and of the 
greateft diminution of the flar’s light, ibid. 

Furiher Obfervations upon, by the fame, p. 5. eo) 
——- on the Periods of the Changes of Light in that Star, in a Letter from John 
Goodricke, Efg. p. 257. Method purfued to determine, with greater precifion, the 
periodical return of thofe changes, ibid. With an explanatory table, p. 288. 
Different obfervers may differ in the duration of the variation, and why, ibid. 

Flamftead has marked this ftar of different magnitudes, at different times, p. 28Q- 
Short abitract of Mr. Goodricke’s late obfervations on Algol, when its leaft magni- 
tude was accurately determined, p. 2g0—2y2.- 
Alhalies. See Te? Liquor. 
Anarrhichas Lupus, A Defcription of the Teeth of that Fifh, and of thofe of the 
Chetodon Nigricans of the fame Author; to which is added an Attempt to prove 
that the Teeth of cartilavinous Fifhes are perpetually renewed, by Mr. William 
Andre, furgeon, p. 274. The fame variety prevails in the internal ftruéture of fifhes 
as in the external form, ibid. Jaws of the wolf-fith defcribed, p. 275, 276. And its 
teeth, p. 277. Theteeth of the Chetodon nigricans deferibed>p. 278. Which fith 
feems to be mifplaced in Linnzus’s Sy ftema Natura, ib. Of the teethof cartilaginous 
; 
. 
fithes, p. 279. See Shark. Their pofterior teeth always found in a foft, membranous 
{tate, and but imperfectly formed, p. 231. Explanaticn of the plates, p. 282. 
Atkins, Mr. John. See Meteorological Fournal, 
Aubert, Mr. See Algol. 
Alexander, Efg. See Derecrs. 

Aurora Borealis, curious account of, by Profeffor Gmelin, p. 228. Rufhing foife 
attending that phenomenon, ibid. 229. 
B. 
Bark-Tree, Account of a new Species of, found in the ifland of St. Lucia, by Mr. 
George Davidfon, p. 452. Botanic character of, by Sir Jofeph Banks, p. 453. Is 
undoubtedly a fpecies of the cinchona, ibid. Extraét of a letter from Mr. George 
Davidfon, dated at St. Lucia, July 15, 1783, giving an account of its difcovery by 
Mr. Alexander Anderfon, and its medicinal qualities, p. 454. Mr. Davidfon’s 
account of it, p. 455. Explanation of the plates, p. 456. 
Barker, Thomas, Efq. See Rain. 
Barometer. See Rain. 
Bergman, Profeffor, his computation of the average height of the northern lights, p. 
227. See Terra Ponderofa. 
Blagden, Charles, M.D. See Afereors. 
C. Cavallo, 
