INDEX. 



Sclf-elevatlon, organ of the inftinft for, 



227 

 — prefervation, organ of the inftindi 



for, 201 

 Scnfations, diftinft, produced by cotem- 



porary founds, 157 

 Senfes, cerebral organs of the external, 



202 

 Sextant, Imperfections of, 218 

 Shavings of wood, on the electricity of, 



49 

 Sleep of animals in winter, queftion on, 



278 



Sliders, harmonic, Dr. Young's account 



of, 101. — Illuftrative of the theory of 



. the tides, ib. — Applicable to a variety 



of cafes, 102 



Smith, Dr. his theory of compound founds, 



152 

 Soap, made of vegetable wax, 190 

 1 bubble, the black fpot in it produced 



by undulations of light, 184 

 Society, literary and philofophic, at New- 

 castle, 59.— For examining the zodiac, 

 146 

 Sound, mufical, produced in tubes by hi- 

 drogen gas, 23.— Apparatus for con- 

 ducing, 69— Primitive, net the fame 

 as grave harmonics, 74. — Theories of 

 compound, 152, 153, 154. — Senfations 

 produced by, 157.— -Experiments on, 

 207 

 Speaking machines, 70 

 Spedlrum, ptifmatic, compofed of only 



four primary colours, 98 

 Speer, Mr. W. on the hidrometer, 63 

 Spermaceti, comparifon of it with royrtle- 



wax, 134 

 Springs, enquiry into the origin of, 159. 



— -Caufes of, 172 

 Steam, defcription of a joint for tubes ufed 



in conveying, 107 

 Steel, appearances produced by collifion 

 with hard bodies, 103.— Under what 

 conditions it can burn in the air, 104. 

 —Oxidation of, at different tempera- 

 tures, ib. 



Steganographic fcale, 24$ 



Stodart, Mr. 504 



Stop-cocks, invention of fliJing, 4 



Strata, adventitious, on mountains, 26$ 



Stumps of trees, machine for rooting up, 



243 

 Sugar from grapes, 280 

 Sulphate of foda, its ufe in glafs-making, 



281 

 Sulzer, 195 

 Sympathetic inks not to be depended OH 



for fecret writing, 246 

 Syphon-engine for railing weights, 44 



T. 



Telefcope with a double refracting medi- 

 um, 115 



Tenant, Mr. 68 



Tennant, S. Efq. on the compofition of 

 emery, 53 



Thallite, component parts of, 13, 14 



Thames, quantity of water carried off by, 

 164 



Theatrical talent, organ of, 234 



Theofophy, organ of, 235 



Thieboult, 195 



Things, organ of the fenfe of, 229 



Thomfon, Dr. 220 



Mr. 133, 220 



Thought, decompofition of, 279 



Throat, inftrument for extracting hard 

 bodies from the, 175 



Tides, illuftrated by the doctrine of com- 

 bined undulations, and by the harmo- 

 nic Aiders, 101, 102 



Tilas, 256 



Titanium, oxide of, often met with, 214 



Tofcan, 189 



Tree, wax, memoir on, 187 



Trees, machine for rooting up theftumps, 



243» 

 Trevithack, Mr. 49 

 Trotter, Dr. 216 

 Tube, flexible,for gafes, 5.— Metallic with 



a joint, ib. 



■Early invention of, 107 

 Vapour, 



