go6 INDEX. 
Focal length. The effect of different focal lengths irr 
fhewing an eclipfe of Jupiter’s fatellite fooner or later, 
p. 186. 
Fogs, elc&ricity of, p. 422 — 426. Strongly eleCirified 
after froft, p. 426. Greateff obferved divergence of 
the balls, p. 428. Apparatus for obferving the eledlri- 
city of fogs, p. 428. 
Frank/in, Dr. his conjecture on the Aurorae Boreales, 
p. 132. Of the Hilling of waves by means of oil, 
p. 44^- 
Fundamental Interval. Vide thermometer. 
Fundus of the uterus. Petit’s opinion that the fundus of 
the uterus increafes in pregnancy Jefs in proportion than 
any other part, verified in a particular inftance, p. 478. 
G. 
Gafpee , latitude of South point, p. 179. Longitude,, 
p. 189. Immerfions and emerlions of Jupiter’s fa- 
tellites, obferved there, p. 180. 
Gillaroo trout, account of, by the Hon. Daines Barring- 
ton, p. 116. The ftomach of that animal refembles 
the gizzard of a fowl, ibid. In large fillies bigger than 
that of a turkey, p. 120. Has neither roe nor milt, 
ibid. DiffeCtion of the ftomach by Mr. Henry Wat- 
fon, p. 1 2 1. Obfervation, on the Gillaroo trout by 
Mr. J. Hunter, p. 320. 
Gizzard . Differences of gizzard and ftomach, p. 
3 1 1 — 3 1 3 - 
Gold, its conducing power, p.415. 
Greenwich , aftronomical obfervations made there, p. 184. 
H. 
Hales , Mr. miftaken in fuppofing, that the vitriolic acid 
prefer ves acidulse and other chalybeate waters from de- 
cay, p. 366. 
Haygarth, Dr. his obfervations on the bill of mortality 
for Chefter, in 1772, p. 67, 
Heatp 
