INDEX.

Universal Method by Fluxions of, shewing the dif-ferent Effects in Reflexion and Refraction, in. 3 n.Exemplified in the Ellipsis, iii. 5 n. Hyperbola,ibid. Parabola, ibid. And in all spherical, ellip-tical or parabolical reflecting Surfaces, iii. 6 n.Kinds of, what, iii. 19. Visual explained, iii. 397.Globe, Problem curious, for finding its Thickness ii.15211. Celestial, several Problems on solved,'iii.

268, & seq. Astronomical Problems represented on"

iii. 277 n. Terrestrial described, iii. 279. Prob-lems, several solved on, iii. 284.

Gnomonicks, philosophical Principles of, iii. 268 n,GoJJet and de la Denille , Mejfrs. excellent lifting Pumpdescribed, ii. 65 n.

Gravejande , Dr. his Heliostata described, iii. 89 n.Gravitation, Attraction of, i. 82. Of Fluids, i. 252,2ZZ-.

Gravities, specific, Tables of, f. 290 n.

Gravity, ■ what, i. 86. Specific of Fluids how deter-mined, i. 285. Mean, of Air, what, ii. 151 n.Greatest of the Air, ii. 125 n. See Atiraflion.

Gray, Mr. his Experiment to prove the Attraction ofthe Heavenly Bodies electric, i. 41 n.

Gregory J. Dr. Telescope contrived by, iii. 7511. Im-proved by Mr. Hadley, ibid. Small Alteration byMr. Cajfegram, ibid.

Gregory XIII. Pope, reforms the Calendar, iii. 240.Gulf, what, iii. 284.

K.

TTjac, Mr. Experiment for recovering the decayed

J ~1 Virtue of Loadstones, i. 50 n.

Hail accounted for, i. 27.

Hales Dr. his Experiment on several live Animals, !!.n. For producing Air, ii. 115:'.. Graduationson his Thermometers, ii. 186 11. Computationsrelating to Bellows, ii. 218 n. Invention of theSea-gage, 139 11 •

Helley Dr. Hypothesis for the Variation of the Needlej, 46 n. His Observation on Vapours soiling on the^ E e 3 Moun-