INDEX.

Ibid. What Quantity of its visible Surface illu-mined, iii. i2t n. Elongation of, what, iii. 121 n.Phases of shewn by the Orrery, iii. 192. Dark Sha-dow, what Part of the Earth’s Surface it involves,iii. 195 n. Its Appearance in an Eclipse, to whatowing, iii. 202 n. Motion of, similar to that ofthe Ocean, iii. 319. Harvest, see Harvest- Moon.Motion , the Deniers of, deny a Vacuum, i. 11 n . What,

i. 88- Absolute and relative, i. 89 n. Equable,what, i. 89. Accelerated, i. 30. Retarded, ibid.Equable, how generated, i. 90 n. Accelerated,how produced, ibid. C? seq. Continually retarded,how, i. 91 n. Bodies projected upwards, ibid. Ve-locity of, what, i. 91. Momentum or Quantity of,i. Q2. First general Law of, i. 94. Second generalLaw of, i. 97. Third general Law of, i. 99, 103.Of Bodies descending freely in Vacuo, i. 108. SixProperties of, ibid. The Velocity proportional tothe Time of the Fa!!, i. 109 n. The Spaces are asthe Squares of the Times, ibid. Of Bodies descend-ing on inclined Planes and curved Surfaces, i. iii.Six Properties of, ibid. Descent in a resisting Medi-um, ibid. Circular, i. 132. Properties of, !. 136.Law of Gravitation at the Moon hence discovered,i. 141. Mechanical, the sole Principle of, what,

1. 148. Centre of, what, i. 148. Perpetual, Impos-sibility of, i. 162 n. Of Fluids, to what owing, ii.

2. Of Sound, equable, 237 n. Of the Earth’sAxis, physically explained, iii. 351.

Moreland, Sir Samuel , inventor of a Barometer, ii.126 n.

Moses, a Passage from, how to be understood, iii. 96 n.Mountains have no Springs on their Summits, ii. 15 n .How Vapours carried to their Ridges are disposed of,

ii. 13 n. Lunar, curious Problem for measuring theHeight of, iii. 117 n.

Mundane System, iii. 94 n. Isf seq. Idea, august, from,

iii. 96 n. Moses, Passage of, how to be understood, iii,96’n.

Muse, visual, by an ocular Harpsichord, ii. 321 n.'Myops or Purblind Persons, Peculiarities in, iii. 40.