_Perry_, Mr. his letter to Dr. Stukeley, concerning the Earthquake at Sumatra in Nov. and Dec. 1756, p. 491. _Phœnician_ numeral characters anciently used at Sidon, dissertation on them, p. 791. _Plants_, impressions of them on the slates of coals, p. 228. ---- catalogue of the fifty from Chelsea Garden, for 1756, p. 236. ---- observations on the sleep of them, p. 506. ---- catalogue of the fifty from Chelsea Garden, for 1757, p. 648. _Platina_, experimental examination of it, Paper V. and VI. p. 148, 156. _Platt_, Mr. Joshua, his account of the fossil thigh-bone of an animal dug up at Stonesfield, near Woodstock, p. 524. _Polarity_ and Magnetism, communicated to brass, p. 774. _Polypus_, Sea, account of it, p. 777. _Pozzuoli_, account of the temple of Serapis there, p. 166. _Postscript_ to Dr. Whytt’s observations on Lord Walpole’s case, p. 385. _Pringle_, John, M. D. on the virtues of soap in dissolving the stone, p. 221. ---- ---- ---- ---- his account of the effects of electricity in paralytic cases, p. 481. _Problems_, isoperimetrical, a further attempt to facilitate the solution of them, p. 623. _Pulteney_, M. Richard, his botanical and medical history of the Solanum Lethale, p. 62. ---- ---- ---- his observations on the sleep of plants, p. 506. _Pulse_, quickness of it in coughs, attended with infarction of the lungs, lessened by blisters, p. 569. R _Register_, Parish, extract of that in Great Shefford in Berkshire, with observations, p. 356. _Remarks_ on Dr. Job Baster’s Observationes de corallinis, &c. p. 280. _Robertson_, Mr. John, his essay towards ascertaining the specific gravity of living men, p. 30. ---- ---- ---- ---- account of an extraordinary operation performed in Portsmouth dock-yard, p. 288. ---- ---- ---- ---- ---- of the fall of water under bridges, p. 492. S _Salt-water_, experiments on applying Dr. Hales’s method of distilling it to the steam-engine, p. 53. _Satellite_, concerning the irregularities in the motion of one, arising from the spheroidical figure of its primary planet, p. 807. _Sea-water_, method of making it fresh with wood-ashes, p. 635. _Sea Alga_ with broad leaves, observations on it, p. 631. _Series_, invention of a general method for determining the sum of every 2d, 3d, 4th, 5th, &c. term of one, taken in order, p. 757. _Serapis_, Temple of, at Pozzuoli, account of it, p. 166. _Shepey_ Island, account of fossil fruits, and other bodies, found there, p. 396. _Short_, James, M. A. his account of some experiments concerning the different refrangibility of light by Mr. John Dollond, p. 733. _Shefford_, Great, extract of the parish register there, with observations, p. 356. _Simpson_, Mr. Tho. his resolution of a general proposition for determining the horary alteration of the terrestrial equator, &c. p. 416. ---- ---- ---- ---- further attempt to facilitate the resolution of isoperimetrical problems, p. 623.