---- ---- ---- ---- invention of a general method for determining the sum of every 2d, 3d, 4th, or 5th, &c. term of a series, taken in order, p. 757. _Skeleton_ of an animal, description of a fossil one found in the alum rock near Whitby, p. 786. _Slates_ of Coals, account of the impressions of plants on some, p. 228. _Sleep_ of plants, observations on it, p. 506. _Smeaton_, Mr. John, concerning the effects of lightning upon the church and steeple of Lestwithiel in Cornwall, p. 198. ---- ---- ---- his remarks on the different temperature of the air at Edystone, from that observed at Plymouth, between July 7th and 14th, 1757, p. 488. _Snail_, the naked, producing purple, observations on it, p. 585. _Snipe_, or Tringa, a new-discovered species of it, p. 255. _Solanum_ Lethale, Bella-Donna, or Deadly Nightshade, brief botanical and medical history of it, p. 62. _Soap_, its virtues in dissolving the stone, p. 221, 386. _Sponges_, formed by worms, new observations on them, p. 590. _Steam-Engine_, experiments on applying Dr. Hales’s method of distilling salt-water to it, p. 53. _Steam_, farther experiments for increasing the quantity of it in a fire-engine, p. 570. _Stone_, the virtues of soap in dissolving it, p. 221. _Stones_, remarkable instance of four rough ones discovered in an human urinary bladder, extracted by the lateral method of cutting for the stone, p. 579. _Storm_, effects of one at Wigton in Cumberland, p. 194. ---- ---- ---- ---- at Looe and Lanreath, p. 104. _Stonesfield_, account of the fossil thigh-bone of an animal dug up there, p. 524. _Sumatra_, Island of, account of an earthquake felt there in Nov. and Dec. 1756, p. 491. _Swinton_, the Rev. John, his remarks on a Parthian coin with a Greek and Parthian legend, never before published, p. 175. ---- ---- ---- ---- ---- dissertation upon the Phœnician numeral characters antiently used at Sidon, p. 791. T _Tables_ of the variation of the magnetic needle, a sett, which exhibit the result of upwards of fifty thousand observations, adapted to every five degrees of lat. and long. in the more frequented oceans, p. 329. _Tendon_, Flexor, one torn out in its whole extent, and the first joint of the thumb torn off, p. 617. _Thermometer_, state of it at the Hague, Jan. 9, 1757. p. 148. _Thermometers_, description of some for particular uses, p. 300. _Thigh-bone_ of a large animal, a fossil one dug up at Stonesfield, near Woodstock, in Oxfordshire, p. 524. _Thunder_ and Lightning, the effects of them in the parishes of Looe and Lanreath, June 27th, 1756, p. 104. _Torkos_, Just. Joan. observationes anatomico-medicæ de monstro bicorporeo virgineo, p. 311. _Travers_, Mr. Peter, his successful treatment of the gut ileum cut thro’ by a knife, p. 35. _Trees_, some discovered under-ground on the shore at Mount’s-Bay in Cornwall, p. 51. _Trembley_, Mr. Abraham, extract of a letter from him on several curious subjects of natural history, p. 58.