Circular Motion of, 132. Properties, what, i. rz6.Circulation, how accounted for, i. 35 n.

ClauiiatC s Description of Archimedes ’s Sphere, iii.165 n.

Climate , what, iii. 281.

Clock, Mechanism of the Parts of, i. 197 n. Machi-nery of the shaking Part, i. 198. Descending on aninclined Plane, i. 199 n. Mechanism of, ibid. Gfseq. Made to ascend on the same inclined Planeby M. de Gennes, i. 201 n.

Clouds, Electricity from, how discovered, i. 71. Ex-periments on, ibid.

Cohesion, Laws of the Attraction of, i. 17. Of variousBodies, Table of Weight to separate, i. 20 n. is?seq. The Attraction of, solves several Phænomna,

i. 24, i. 32.

Cold, a general Cause of Wind, ii. 203.

Colours, Seven original simple ones, ii. 313. HarmonicProportions of gave the curious Hint of visual Music,

ii. 321 n. How discovered by Sir Isaac New-'ion, ii. 325. The Objects of any of the simple'ones, when viewed through a Prism, what the Ef-fect, and what the Images of them formed by a Lens,ii. '’22. Demonstrated in several Particulars, ii.323 n. Rings of the various Phænomena of shewn

by Experiments and demonstrated, ii. 341 n. Howproduced, illustrated and demonstrated, ii. 347 n.Science of truly mathematical, ii. 35311. Sir IsaocNewton’s Definitions and Precautions about the Doc-trine of, ii. 354 n. Different Sorts of, ii. 354 ' 1 heo-

rv of compounding and decompounding in several!Instances, ii. 3^3 n ’

Celures, Equinoctial and Solstitial, what, iii. 175..Mean Place of found by Sir Isaac Newton, iii. 249,That of the Summer determined, iii. 250.

Comets, revolve about the Sun in Eccentric Orbits, iii.105. And Planets, what Properties of circularMotion observed by, i. isj. That of 1682,1758, the Tract of exhibited, iii. 198. Se-veral Affections of shewn and demonstrated,

iii.