415 



Thermometer, its higher degrees esti- 

 mated by a new register-pyrometer 

 ii. 404. 



Thermometrical barometer for mea- 

 suring altitudes, ii. 68 ; measure- 

 ment of Snowdon by, ii. 132. 



Thomas (H. L.), anatomical descrip- 

 tion of a male rhinoceros, i. 41. 



Thomson (Dr. Thomas) on oxalic acid, 

 i. 285 ; analysis of a new species of 

 copper ore, i. 479 ; on some of the 

 compounds of chromium, ii. 313. 



Threads of glass, their elasticity ap- 

 plied to torsion balances, ii. 402. 



Tiarks (Dr. J. L.), observations made 

 with chronometers for ascertaining 

 the longitude of Madeira and Fal- 

 mouth, ii. 219. 



Tides between Fairleigh and the North 

 Foreland, and explanation of the 

 supposed meeting of the tides near 

 Dungeness, ii. 113. 



Tillard (S.), narrative of the eruption 

 of a volcano in the sea off the Island 

 of St. Michael, i. 422. 



Timber, on the expansion and contrac- 

 tion of, ii. 73. 



Tin mine, Relistian, account of, i. 275. 



Titanium, metallic, ii. 180, 199. 



Toad, common, on the poison of, ii.262. 



Todd (J. T.), experiments on the tor- 

 pedo, ii. 36, 57. 



Tongue, on the structure of the, i. 111. 



Torpedo, experiments on the, ii. 36, 

 57, 354. 



Torsion, modulus of, in different species 

 of wood and of metals, ii. 362. 



Torsion balance constructed with 

 threads of glass, ii. 402. 



Transit instrument, made by Mr. Dol- 

 lond for the Cambridge University, 

 ii. 246; on the derangements of, 

 ii. 261, 311; description of Sir J. 

 South's, ii. 285. 



Tredgold (T.) on the elasticity and 

 strength of hard and soft steel, ii. 

 218. 



Trees : on the ascent of the sap, i. 53; 

 the descent of the sap, i. 118, 201 ; 

 the motion of the sap, i. 147; state 

 in which the sap is deposited during 

 winter, i. 172; reproduction of buds, 

 i. 200; on the inverted action of the 

 alburnous vessels, i. 236 ; on the for- 

 mation of the bark, i. 258 ; on the 

 inconvertibility of bark into albur- 



num, i. 290 ; on the alburnum of, i. 

 311; origin and formation of the 

 roots, i. 328 ; on the parts impaired 

 by age, i. 368 ; on the causes which 

 influence the direction of the growth 

 of the roots, i. 398 ; on the expansion 

 and contraction of timber in different 

 directions relative to the position of 

 the medulla, ii. 73 ; on the office of 

 the heart wood, ii. 87. 



Trigonometrical survey, i. 33, 129. 

 ii. 185. 



Trimmer (W. K.), account of some 

 organic remains found near Brent- 

 ford, i. 459. 



Troughton (E.), method of dividing 

 astronomical and other instruments 

 by ocular inspection, i. 323. 



Turner (Dr. E.) on the composition of 

 chloride of barium, ii. 377. 



Twins, Siamese, account of them, ii. 

 397. 



U. 



Ulmin, i. 447. 



Uran-glimmer, on two species of, i. 209. 



Ure (Dr. A.), experimental researches 

 on caloric, ii. 97 ; on the ultimate 

 analysis of vegetable and animal sub- 

 stances, ii. 179. 



Urethra: human, on the, ii. 130; on 

 the re-establishment of a canal in the 

 place of a portion which had been 

 destroyed, ii. 149. 



Uric acid : on the effects of magnesia 

 in preventing an increased formation 

 of, i. 363, 469 ; purpuric acid ob- 

 tained from, ii. 100. 



Urinary calculus : on the structure of 

 calculi, i. 303, 305 ; account of one 

 of uncommon magnitude, i. 339; 

 cystic oxide, a new species of, i. 376 ; 

 on the tendency to calculous dis- 

 eases, ii. 359, 412; analysis of se- 

 veral belonging to the Norfolk and 

 Norwich Hospital, ii. 359. 



organs and secretions of some 



of the amphibia, ii. 94 ; of two spe- 

 cies of the liana, account of, ii. 1 40. 



Urine : on the composition of, i. 364; 

 influence of acids upon the composi- 

 tion of, i. 469 ; of the camel, on the, 

 i. 244 ; its dissimilarity in animals 

 whose diet is similar, ii. 140. 



Uterine system in women, on a mal- 

 conformation of, ii. 95. 



