INDEX. 



551 



Saturn's ring, appearance of, in the 

 equatoreal of Cambridge, United 

 States, 519. 



Schunck (E.) on the colouring matters 

 of madder, 204. 



Sea-water, on carbonate of lime as an 

 ingredient of, 232, 308. 



Shooting stars, observations on, 356. 



Silliman (Dr. B., jun.) on several 

 American minerals, 451 ; on a 

 granular albite associated with co- 

 rundum, and on the Indianite of 

 Bournon, 484. 



Sillimanite, fibrolite and Bucholzite, 

 on the identity of, with kyanite, 

 459. 



Slatter (J.) on the aurora borealis of 

 Feb. 22, 1849, 71. 



Smythies (J. K.) on the universal law 

 of attraction, 234. 



Solar objects, easy mode of measuring, 



467. 



Solar phsenomenon, account of a re- 

 markable, 437. 



Soubeiran (M.) on chloroform, 314 ; 

 on the composition of honey, 

 398. 



Sounds, on the views of the Astrono- 

 mer Royal respecting the modifica- 

 tion of, 241. 



Star, binary, on the determination 

 of the most probable orbit of a, 

 386. 



Stars forming binary or multiple 

 groups, on the alleged evidence for a 

 physical connexion between, 132. 



Steam, on the electricity of, 490. 



Stearic acid, on the composition of, 

 237. 



Stenhouse (J.) on the nitrogenous 

 principles of vegetables as the 

 sources of artificial alkaloids, 534. 



Stokes (G. G.) on the variation of 

 gravity at the surface of the earth, 

 228 ; on a differential equation re- 

 lating to the breaking of railway 

 bridges, 230. 



Storax, liquid, experiments on, 72. 



Struve (M.) on the amount of silica 

 contained in some plants, 181. 



Styracine, observations on, 74. 



Styrol, experiments on, 73. 



Sulphuric acid, natural sources and 

 new mode of preparing, 467. 



Sulphurous acid, on the hydrates of, 

 393. 



Summers (E, C.) on a simple appa- 

 ratus for washing precipitates, 96. 



Teeth, on the microscopical structure 

 of, 531, 540. 



Terebene, on the preparation and pro- 

 perties of, 477. 



Teredo navalis, on the nature and 

 ravages of the, 526. 



Thermometrical observations made at 

 the apartments of the Royal So- 

 ciety, on the reduction of the, 151. 



Thompson's (D. P.) Introduction to 

 Meteorology, reviewed, 225. 



Thomson (W.) on a mathematical 

 theory of magnetism, 540. 



Thorel (M. L.) on the detection of 

 small quantities of iodine, 395. 



Tides, on the theory of the, 149, 187, 

 264, 338. 



Tomes (J.) on the structure of the 

 dental tissues of marsupial animals, 

 and more especially of the enamel, 

 540. 



Unionite, analysis of, 457. 



Urine, on the variations of the acidity 

 of the, and on the influence of me- 

 dicines on the acidity of the, 152 ; 

 analysis of the ashes of, 273. 



Valeramine, on the preparation and 

 composition of, 313. 



Vegetables, on the formation of fatty 

 matters in, 158 ; on the nitroge- 

 nous principles of, as the sources of 

 artificial alkaloids, 534. 



Verneuil (M. E. de) on the geological 

 structure of the Asturias, 34. 



Villarceau (M. Yvon) on the deter- 

 mination of the most probable orbit 

 of a binary star, 388. 



Vitrification, on the influence of bo- 

 racic acid upon, 478. 



Vcelcker (Dr. A.) on the chemical 

 composition of the fluid in the 

 ascidia of Nepenthes, 192. 



Voltaic arc, observations on the, 289. 



ignition, on the effect of sur- 

 rounding media on, 114. 



Watkins (Rev. C. F.) on the aurora 

 borealis of the I7th of November, 

 1848, 69. 



Wax, investigation of the chemical 

 nature of, 244. 



Weather, remarks on the, 137, 357. 



Weber (M.) on the inorganic consti- 

 tuents of peas and pea-straw, 171 ; 

 of rape-seed and rape-straw, 177; 



