INDEX,

Considerations to be regarded in the Rife of Fluidsin, i. 27 n. Table of Experiments on various Fluidsin, i. 28 n. Extraordinary Phænomenon in accountedfor, i. 29 n. Phænomenon curious, accounted for,35 n -

Cajsmi’ s Barometer, ii. 126 n. Five Satellites of Sa-turn discovered by, iii. 127 n.

. Caswell, Mr. Description of his Barometer, ii. IZ0 n,Not fit for comtnon Use, why, ii. 131 n.

Catalogue of the Stats, iii. 262 n.

Catenaria Curve, if inverted, the best: Form for artArch, i. 234 n.

Catoptrics , what, iii. 2 n.

Causes for the Descent or Rife of Fluids, ii. 2.

Cavendi/Jj, Earl of, a curious Construction of Thermo--meters by, ii, 18711.

Central Forces, i. 133, 136.

Centre of Oscillation, what, i. 122. Of Magnitudewhat, i. 148. Of Motion, what, ibid. Of Gra-vity, what, ibid, Sole Principle of mechanical No-tions, ibid. Ten properties of, i. 149. SeveralPhænomena solved by, ibid. seq. Several Parti-culars of demonstrated, i. 150, & seq. Of Gra^vity in Bodies connected together, what, i. i 5 ° !Of the Earth and Moon, i. 157. Of the Sun andPlanets, ibid. Several Particulars of demonstrated,i. 157 n, seq. Common, the Cause of severalPhænomena, i. 158.

Centrifugal Force, what, i. 135.

Centripetal Force, what, i. 136.

Chamber , dark, fee Camera obscura.

Charts and Maps, philosophical Principles of, iii. 306 N,

Chord , Musical, a singular Property of, ii. 264. De-monstrated, ibid, 0 seq.

Chronology , Astronomical Principle? of by Sir IsaacNevjton , iii. 248.

Cicero’s Description of Pefdonius the Stoic’s Orrery,

166 n.

Cimento, Academia del , Mistake about the Velocity ofSound, to what owing, ii. 238 n.

Circle and Index Horary, iii. 177.

Circles , artlic and antarctic, what, iii. 176.

c ' ' Circular-