INDEX.

the Axis os, investigated by-Sir Isaac Newton, iih170 n. Shadow, to find Magnitude of, iii. 193 mMethod of measuring its Magnitude, iii. 292 n.Attempted in Holland by Snelling and Muschenbroek ,iii. 293. By Norwood in England, ibid. 'Its Figurewhether an oblate or oblong Spheroid, iii. 294 n.N. Pole Mensuration of a Degree at, for determining,iii. 29511. Axis, Physical Explication of, iii. 751,& seq.

East Wind, tinder the Equator, ii. 207 n.

Ebullition and Heat accounted for, i. 37 n.

Eccentricities of the Orbits of the Planets, iii. 144 n „.Inconsiderable, iii. I 5 2, Their Motions circular,iii. 153.

Echo, what, ii. 239. Nature of, accounted for, ii.241 n. Of a single Sound observed by Dr. Derham ,ii. 244 n. Polyphonous Uses of, ii. 244 n.

Eclipse of the Sun, iii. 196 n. Calculated when noRefraction alters the Latitude, iii. 198 n. C seq.Where it has any Latitude, iii. 197 n. & seq. Onan equinoctial Day represented, iii. 200 n. Lunar,constructed, iii. 201 n. Theorem for finding theEcliptic Limit, iii. 202 n.

Ecliptic, the Inclination of the Planets Orbits to, iii.108 n. What, iii. 173. Signs on the, Names of,ibid.

Effluvia, Magnetic, Method of rendering visible, i*

44- n. .

Elasticity, to what owing, 1. 33 n.

Eledlrical Bodies, Attraction of, i. 39. Their Proper-ties, ibid. and i. 41 n. Experiments by Mr. Canton ,i. 52, £? seq. Queries concerning, i. 62. Exhi-bited in an easy Manner, i. 63, & seq. FurtherExperiments by Mr. Canton, i. 67, U seq. TwoSorts of, i. 41 n. Difference of Vegetable and A-nimal Substances, ibiu. C seq. Positive and nega-tive Powers of, how excited, i. 69. Of the Atmos-phere, may be observed in Winter, i. 73. From theClouds in the open Air, how discovered, i. 71,Elements to which Bodies may be reduced, what, 1.

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