INDEX.

Pendant, Description of, ii. 127 n. Its Fault, ibid-Compound, by Mr. Rowning, ii. 128 n. By Mr.Caswell, described, ii. 130 n. Common, measuresthe Gravity of the Air best, ii. 131 n. The Usespf, ii.' 132 n.

Bar-poot in Warwickshire , Account of a Water-millat, i. 208 n.

Bees, their' Cells geometrically constructed, i. 234 n.

Beigbion, Mr. his Table of Experiments for the Powerof Fire-engines, ii. 84 n.

Bellows, Theory of, ii. 217 n.

Bernouilli’s Barometer, ii. 126 n.

Bissextile, why so called, iii. 238.

Bladder, blown, Experiment on for strewing the Elasti-city of the Air, ii. 135.

Blackness, what, ii. 362 n. Consequences from, ib.

Bodies, particular, consist of the fame Matter, i. 3.To what Elements reducible, >. 5. With one andtwo Dimensions how expressed, i. 6. Common Pro-perties of, what, ibid. Platonic, Number of, i. 9 n.Property of, ibid. Regular, Number of, ibid. Tablesof for the Cohesion of various, i. 23 n. Hardness ofaccounted for, i. 32 n. Electrical Attraction of, i. 39.Attraction in the heavenly of the electric Kind, ac-cording to the Experiment of Mr. Gray, i. 41. n.Weight of Matter in, how expressed, i. 48 n. Abso-lute Weight of, what, ibid. Descend by Gravity inright Lines, i. 85. Why with equal Velocity, ib. n.Farther Illustration of, i. 86. Forces with which aBody is attracted on two Spheres of the fame Den-sity, i. 87. Forces of, are as the Number of at-tracting Particles, ibid. Gravity of, decreases withthe Distance from the Centre, ibid. Projected up-wards, Observations on, i. 91. n. Free Descent of inYaan, i. 108. Properties of, i. 16, 111. Descent ofon inclined Planes and Curve Surfaces, i. iii. Con-nected together, the Centre of Gravity in, i. IZ6,157. Force of, famous Controversy about, i. 241-Tranfparent Parts of, reflect Rays of one Colourgnd transmit those of another, ii, 358 n. Sizes of