INDEX. 197 



Thames-water, observations on the saltness of, in particular 

 places, ill. 367. Its extreme softness accounted for, ib, 



' river, probable mischiefs from, on taking down and re- 

 building: London-bridge, xvi. 27, Remarks on Mr. Rennie's 

 design for a new bridge over, 28 



-, design by Mr. Ware, for making a public road 



under, xviii. 62. Notice of other tunnels attempted or pro- 

 posed, 66 



Thenard (M.), analysis of his Trade de Chimie, ii. 255. Remarks 

 on his mode of treating chemical affinities, 256. On heat and 

 expansion, 250. On cold, 268. Defects in his chapter on 

 light, 2^. On electricity, 261. On chlorine, 264; and com-* 

 bustion, 265. Remarks on his classification of the metals, 

 266 ; and on the metallic salts, 269. Defects of his chemical 

 physiology, 271. Concluding observations, 272 



- new results of, on the combination of oxygen with 



water, vii. 379. viii. 114, 154 



process of, for restoring the white in paintings, x. 



168 



Blue colour, invented by, preparation of, xv. 381 

 Theodolite, patent portable, described, vi. 65 

 Thermo-electrics, table of, xvi. 171. Experiments in thermo- 

 electric magnetism, 126 ; and in thermo-electric rotation, 372. 

 Phenomenon with iron, 374 

 Thermometer (chromatic), account of, i. 119 



— for measuring heights, notice of, iii. 372 



new and delicate, account of, vii. 183 ; and of new 



self- registering, 185 

 (differential), description of, viii. 218 



Thermometers, variation of, xiv. 441. xv. 160, 361 



Thirst, sense of, how produced, ii. 12. vi. 13 



Thomas (St.), island, geological structure of, v. 313 



Thompson (Dr.), mistake of, corrected, i. 229. On the composi* 



tion and combination of phosphoric acid, 291 

 ■ system of chemistry by, character of, ii. 253 ; review 



of, iv. 299 ; its want of system exposed, 300 ; strictures on 



