I N D E X.

and universal, iii. 53. Microscope Solar, what, in.80. Difference between it and the Magic Lanthorn,iii. 81. Common, Form of illustrated, iii. 88 n.Two Forms of, iii. 86 n. How used, iii. 87. Newone, iii. 366. Several Improvements in, seq.Its various Parts described, iii. 368. Universal,elegant Construction of, iii. 364.

Mill, Construction of Dr. Barker's new invented one,

i , 2I 5 ”•

Mills. See IVater and Wind-Mills.

Mineral Springs, how caused, ii. 18 n.

Mirrours, prodigious Effects of, ii. 287. The Powerof Burning in M. Villette's, computed, ii. 288 n.What and how many Sorts of, iii, 19. Convex,Reflection in illustrated, iii. 20. Convex and con-cave, Rule for finding the focal Distance of, iii. 21.

Mobility of Matter, what, i. 10.

Modifications , various, form the Difference of Bodies,

i. 3. See Matter.

Momentum , or Quantity of Motion, what, i. 92. Inthe compound Ratio of the Quantity of Matter andthe Velocities of Bodies conjointly, i. 93. GeneralExpressions for, ibid. n.

Monsoons , various in different Seas, ii. 204 n. Theirbreaking up, what, ii. 205 n. Causes of, ibid.

Month , periodical and fynodical of the Moon, what,iii. 119 n.

Moon, its Attraction causing the Tides, ii. 91 n. Whenconspiring with that of the Earth, illustrated, ii. 93.When that of the Sun is added, illustrated, ii. 94.And Sun, Forces of in raising the Waters computed,

ii. 102 n. The Elevation of the Waters in by theEarth estimated, ii. no n. Her Force only sensibleon the Waters, ibid. Without any Atmosphere,why, iii. 116 n. Has Variety of Mountains, ibid,Spots on, what, iii. 117 n. Cavities, deep, ibid.Bright circular Limb, why it does not appear jag-7ged, iii. 1x8 n. Has no Seas or Lakes, ibid. Spotsin, unchangeably the fame, ibid. Periodical Month,what, iii. 119 n. Synodical, what, ibid. Phases,different, of, accounted far, iii. 120 n. Libration,what, iii. 120 n, Orbit and the Phænomena of,

ibid,