Cais 
cion of a miftake arifes, p. 185. Beftkind of illuminator defcribed, ibid. Hints to 
aftronomers, if a general plan be fet on foot, 187—18g9. Aftronomical obfervations 
made at Chiflehurft in Kent, 190—200. On the eclipfe of the moon, July 50, 
1776, p. 190. Eclipfe of the fun, June 24, 1778, p. 192. Eclipfe of the 
moon, Nov. 23, 1779, p: 193. Eclipfe of the fun, O&. 16, 1781, p. 194. Eclipfe 
of the moon, Sept. 10, 1783, ibid. Tranfit of mercury over the fun’s dik, 
Nov. 12, 1782, p- 197. Occultation of Saturn by the moon, February 18, U7 
ibid. Occultations of ftars by the moon, p.198. Eclipfes of Jupiter’s fatellites, p. 
199. Explanation of the figures in tab. V. p. 200. 
Flamfiead. See Algol, 
Froff, an Account of a remarkable one on the 23d of June, 1783. Ina letter from the 
rev. Sir John Cullum, Bart. p. 416. State of the air when the froft happened, ibid. 
Remarkable eifeéts of this unfeafonable froft, ibid. p. 417. State of the weather 
previous toit, p. 417. 
G. 
Gaging the heavens. See Confiruction of the Heavens. 
Gold, Experiments on mixing Gold with Tin. In a Letter from Mr. Stanefby Alchorne, 
of his Majefty’s Mint, p. 463. The general opinion of metallurgifts concerning 
the mixture of gold with tin, as exprefled by Dr. Lewis, ibid. Experiments, thew- 
ing that tin, in fmall quantities at leaft, may be added to gold, without producing 
any other effect than what might eafily be conceived, 4 priori, from the different tex- 
ture of the two metals, p. 464—467. Experiments 1, 2, 3, 4, 5. with different 
proportions of pure tin and refined gold, p. 464, 465. Experiment 6. to determine 
how far the fumes of tin, brought into contact with gold, would do more than mix- 
ing the metal in fubftance, p. 465. Conclufions from the foregoing experiments, p. 
466. Experiment 7. to difcover whether the two metals might be more intimately 
combined, and the mafs rendered brittle by additional heat, ibid. Experiments &. 
and g. with mixtures of gold and tin, from exp. 2. and 4. and an ounce of copper 
added to each, p. 467. Experiments 10. and 11. with equal parts of the laft mix- 
ture and of the bar from exp. 3. ibid. Experiment 12. to examine whether the 
adding of tin to gold, already alloyed, would caufe any difference, ibid. General 
conclufions, p. 468. 
Goodricke, John, Efg. See Algcl. Has one of Sir Godfrey Copley’s medals adjudged 
to him, p. vii. | 
Hi. 
Halley, Dr. See Meteors. 
Hala, or Rainbow, ncommon one, pe ge 
Farwicke 
