568 



INDEX. 



Tachylite, analysis of, 77. 



Talbot (II. F.) on the iodide of raercurv, 

 336. 



Temperature of vegetables, 1. 



Thibierge (M.) on chloride of gold as a 

 test for vegetable alkalies, 489. 



Tithonicity, a new imponderable sub- 

 stance, 453. 



Torsion-rod, experiments with the, 111. 



Tourmaline, on the optical constants of, 

 277. 



Tubercles, on the nature of, 171. 



Turpeth mineral, on the composition of, 

 35. 



Turtles, description of the fossil remains 

 of six species of, 370. 



Ultramarine, on the blue colour of, 156. 



Uranite, on the production of artificial, 

 387. 



Uterus, on the nervous ganglia of the, 

 228. 



Uvic acid, on the salts of, 18. 



Vapour, aqueous, on the force of, 389. 



Vegetables, on the influence of the dew- 

 point on, 1. 



Venus, on the lunar occultation of, Sept. 

 11, 1841,58; on the mass of, 398, 529. 



Vogel (M. jun.) on a method of distin- 

 guishing between nitrates and chlo- 

 rates, 74 ; on curcumine, 233 ; on pep- 

 sin, 491. 



(M., sen.) on the existence of sul- 

 phur in plants, 74 ; on the action of 

 salts on living plants, 76. 



Voltaic battery, observations on the con- 

 stant, 329 ; on a remarkable new, 417; 

 on the polarity of the, 485. 



circuit, new definition of the, 248. 



combinations, observations on, 54. 



Wackenroder (II.) on the solubility of 

 the insoluble salts of the alkaline 

 earths in hydrochlorate of ammonia 

 and chloride of sodium, 236 ; on the 

 precipitation of certain salts by excess 

 of acids, ib. 



Walker (C. V.) on electrotype manipula- 

 tion, 61 ; on lightning conductors, 63, 

 310, 313. 



Wallace's (Prof.) property of the para- 

 bola, proof of, 219. 



Waller (Dr. A.) on the coloured films 

 formed by iodine, bromine, and chlo- 

 rine upon various metals, 426. 



Warington (R.) on the change of colour 

 in the biniodide of mercury, 192 ; on 

 the red oxalate of chromium and pot- 

 ash, 201 ; on a new chromate of man- 

 ganese, 380. 



Water, action of, on lead, 158. 



Weppen (M.) on the production of formic 

 acid in oil of turpentine, 236. 



Wettinger (M.) on an instrument for ob- 

 serving right ascensions and declina- 

 tions of stars, 477. 



Wiggers (A.) on the presence of anti- 

 mony in arsenious acid, 238. 



Williams (Rev. D.) on the true position 

 in the Devonian system of the Cornish 

 killas, 25. 



Wind, effect of the direction of the, on 

 the difference between distant baro- 

 meters, 222. 



Wbhler (Prof.) on opianic acid, 449. 



Yeast, on the preparation of artificial, 

 352. 



Yorke (Lieut.-Col. P.) on the effect of the 

 direction of the wind on the difference 

 between distant barometers, 222. 



END OF TH 



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