I 



N 



D E 



X. 



563 



Survey, trigonometrical, of England and 



Wales, ii. 550 

 Sufpenfion of the Mariner's Compafs, i. 426 

 Swan, Major, C. ii. 315 

 Switzerland, Geography of, i. 47 

 Sydney Earth, Doubts concerning its Exift- 



ence, i. 404. Analyfis of, ii. 7* 

 Sylvius Eneas, i. 75 



T. 



Table of the Degrees of Baum^'s Hydro- 

 meter, i. 39. Of Expanfions of Metals, 

 by Heat, i. 58. Of Specific Gravities of 

 Ardent Spirit, i. 117- Of Specific Gra- 

 vities of Alloys of Tin and Lead, 118. 

 Of the new French Meafurrs, i. 198, 332. 

 Of Experiments of the Force of Gun- 

 powder, i. 468. Of the Power of Salts 

 for producing Cold, i. ;oi. Of French 

 and Englifli Meafures, ii. J 84. Of the 

 Prices of the Ncceflaries of Life, &c. for 

 700 Years, ii. 284 



Tachenius, i. 363 



Talc, its Elcftric Capacity, i. 358 



Tamerlane, ii. 319 



Tanning, by Defmond's Paitent, i. 26. The 

 Improved Procefs of, by Seguin,- i. 271. 

 Prouft on the Principles of, ii. 337 



Tapping of Screws, Enumeration of Errors 

 in this Procefs, i. 161 



Tar from Coal, i. 494. Mountain, or Mi- 

 neral, ii. 203 



T?rtar, Alkali of. Impropriety of its various 

 Denomiiiatienf, i. 597 



Tartareous Acid, Method of detcfting the 

 Adulteration of, ii. 121 



Taflaert, C. i. 77 



Taffie, Mr. ii. 62 

 ' Taylor, Mr. his Mill-wheels, i. 329 



Telegraph, Mr. Edgeworth's, ii. 320. Dr. 

 Hooke's, ii. 319 



Telefcdpes, Achromatic, i. i. Telefcopes 

 improved by an Iris, or variable Aper- 

 ture, i. I So 



Tellurium, anew Metal, ii. 372 



Temperature, Effc&s of the Change of, on 

 Metallic Bodies, i. 62. Of the Globe, 

 Eifefts of Water in equalizing, i. 567. 

 Efftfts of the Change of on compound 

 metallic B.irs, i. 576. Table of, near the 

 North-wetttrn Lakes of America, ii. 318 



Tempering of Steel, new Mode of, i. 38 i 



Tenacity and Hardnefs in Steel are diftinft 

 Qualities, i. 381 



Tennant Smithfon, efq. F.R.S. on the Na- 

 ture of the Diamond, i. 177, 199. On 

 the Aftion of Nitre on Gold, and Pla- 

 tina, i. 30 



Tenon, i. 46 



Terra Auftralis, or Sydnea, Analyfis of, 

 ii. 72 



Tertullian, i.138 



Teftaceo, Mount its cold Caves, 229 



Tcffier, Cit. on the Sugar-maple, ii. 304 



Tetens on Polynomials, i. 47 



Teyler, i. 242 



Thames, Tunnel beneath, ii. 239, 473 



Theo, ii. 185 



Theophraftus, ii. 136 



Theories of the cold Winds, iffuing from 

 the Earth, i. 233, 235 



Thefeusj ii. 3 19 



Thomfop, Sir Benj. his Donation for a Prize, 



i. 188, 225. ii. 254 



Thouvenel, Mr. i. 170 



Thunder Cloud, Experiments with aa ar- 

 tificial, i. 436. 



Thunder Storm, Change of Colours, and 

 Direftion of Clouds, during a, i. 265 



Tillet, Matthew, i. 140. On the Alloy of 

 Gold with Tin, ii. 140, 179 



Tilloch, Mr. ii. 476 



Timber Trees, advantageous, ii. 333 



Time-pieces, Methods of Correfition for 

 Temperature, i. 55 



Tin, Obfervations on the Acid of, by Guy- 

 ton, i. 543. Effeft of a Mixture of Gold 

 with, ii. 140, 179. Prouft on its Oxyda- 

 tion, ii. 515 



Tints, Determination of, i. 93 



Toaldo, Profeflbr, i. 581 



Tompfon on the Thermal Baths of Italy, 

 i. 239 



Toole, Charles, ii. 224 



Torpedo, Experiments toafccrta.in the The- 

 ory of its bhock, i. 355 



Tournfol, Blae, Procels for making, ii. 311 



Townfon, Dr. i. 95. Philcfophy of Mine- 

 ralogy, ii. 378 



Tracy, i. 46 



Tragacanth, Gum, ii. 409 



Tranfaftions, Philofophical, i. 191,479.11. 

 142, 425 



Tranfmiflion of Sounds, Experiments on 

 the, i. 41! 



Travels in Germany and Switzerland, i. 47. 

 Mr. Park's in Africa, ii. 253,285, 329, 379 



Trcmbley, i. 97 



Trees, Account of three diferent Kinds of 

 advantageous Timber, ii. 333 



Trevor, Mr. ii. 95 



Trigonometrical Survey of England and 

 Wales, ii. 550 



Trigonometricus, i. 238 



Troil, Archbifliop Von, ii. 207 



Trommfdorff, Profeffor, his Produftion of 

 Rock-cryftal in the humid Way, i. 217. 

 ii. 71 ., ' 



Trooftvvyck.M. Pacts Van, ii. 29 



Troughton, Mr. i. 59. ii. 96, 314 



Trudaine, Mr. i. 32 



Tuckert, Mr. his Defcription of the Dutch 

 Procefs for making Cinnabar, ii. 2 



Tunnel beneath the Thames, ii. 239, 473 



Turkey Oak, ii. 335 



Tufcany, Grand Duke of, ii. 265 



Tyrenfis Willermiis, i. I39 



Tzetzes, ii. 16, 20 



U. 



Undulation of Eleftricity, i. 84 



Unifon, Caufes of its Differences in different 



Inftrurr.ents, ii. 188 

 Univerfal Charafter, by Dr. Anderfon, ii. 



189. By Dr. Brown, ii. 190 

 Urine of Animals, Phofphoric Acid not 



contained in the, ii. 71 

 Uvedale, John, B.A. on the Founder of 



Huln Abbey, Northumbeiland, ii. 188 

 Uxbridge, Lord, ii. 367 



V. 

 Vacuo, Combuftion of Phofphorus in, i. 279 

 Vaili, i. 363 



Valliere, ii. 89 



Vandelli, Profeffor, on Foffil Pruffian Blue 

 and native Copper, ii. 508 



Vander Monde, i. 210. ii. 64 



Van Marum, Dr. Martinus, his New and 

 Powerful Eleftrlcai Machine, i. 83. ii. 245, 

 528. On Combuftion of Phofphorus, i. 

 279 



Van Mons, i. 44, 46, 144, i65, 16S, 

 359. idj, 444. ii. 374. On Detona- 

 tions, ii. 469 



Van Trooftwyk, i. 44, 240, 241, 242 



Varley, Mr. his perpetual Motion, i. 334, 



375 



Varto, ii. 136 



Vauquelin, i. 46, 53, 143, 168, 177, 204, 

 210, 228, 248, 313.318, 361,364,385, 

 444, 535. ii. 6, 71, 105. On Siberian 

 Red Lead, ii. 145, 156,213. His Ana- 

 lyfis of the Beryl, and Difcovery of a new 

 Earth, ii. 358. His Analyfis of the Si- 

 berian Red Lead, with Experiments 911 

 the new Metal (Chrome) which it eon- 

 tains, ii. 387. Analyfis of the ChryfoKte, 

 ii. 414. On the Siberian Red Lead, ii. 

 441 



Vega Garcillaffo Tie La,, i. 74 



Vegetable, foluble Principles of Aftringent,. 

 i. 274 



Vegetable Colours, or Lakes of, ii. 155. 

 Matter, Devclopement of Carbon in, ii. 

 208 



Velho Gonfalvo, i. 74 



Venturi,J. B. i. 203, 205, 206,209. ^'^ 

 the Principle of the lateral Communication 

 of Motion in Fluids, &c. i. 524, Effay 

 on the Works of Leonardo Da Vinci, i. 

 599. On the lateral Communication of 

 Motion in Fluids, ii. 172, On the lateral 

 Motion of Fluids, i. 273, 422, 487. ii. 51, 

 84, 89, 93 



Veruiam, Bacon, on Univerfal Language, ii, 



343-. 



Vclpucius, i. 73, no 



Vcffels, wide-mouthed,. Method of clofing 

 to render them Air-tight, i. 260 



Vieweg Ftid, i. 47 



Viilars, Cit. ii. 23>6 



Villtterque, Cit. ii. 138 



Vince, Rev. S. A.M. F.R.S. on the Lever, 

 i. 541 . On the Reliftance of Bodies mov- 

 ing in Fluids, ii. 142 



Vinci, ii. 83. 



Vinegar, diftiiled. Method of dete61ing the 

 Adulteration of, ii. 120 



Virgil, ii. 13 



Vifion, Relearches on the Procefs by which 

 it is rendered diftinft, i. 305, 472, 549. 

 Le da Vinci on, ii. 89 



Vitality, Chemical Procefs of, i. 359 



Vitriol, Oil of, Examination of the Pucity 

 of, ii. 1 18 



Vitriaco Jacobus de, ii. 139 



Vitruvlus, li. 50 



Voices, Variety of, ii. 188 



Volatile Oils, how affeded by Cold, i. i2i, 

 227 



Volcanic Prod uflions, i. 285 



Votta, i. 203, 256, 257, 335, 396, 397, 39S 



Von Aken, M. i. 279 



Vulliamy, Mr. Benjamin, his- artificial over- 

 flowing Well, ii. 276 



Wadftrom, 



