INDEX. 
vegetable colours, 5, 170, 107, 135, 
246; on the Daguerreotype plate, 
120. 
Redfield (W. C.) on the evidence of a ge- 
.neral whirling action in the Providence 
tornado, 38. 
Reiset (M.) on the new method of estima- 
ting nitrogen, 286, 317. 
Retina, on luminous impressions on the, 
434, 
Rock-basins in Southern India, remarks 
on, 62. 
Rocks and veins which form the opposite 
walls of cross veins, observations on, 
373, 443. 
Royal Astronomical Society, proceedings 
of the, 228, 299, 385; address of pre- 
sident, 305. 
Royal Institution, proceedings of the, 570. 
Royal Irish Academy, proceedings of the, 
399, 492. ° 
Royal Society, proceedings of the, 135, 
480; address of the president of the, 
136. 
Russia, on the geology of, 527. 
Rutherford (W.) on Pascal’s theorem re- 
lative to the hexagon inscribed in a 
conic section, 168; on some useful 
theorems in the geometry of coordi- 
nates, 353. 
Salts, on the electrolysis of, 461. 
Sanguinarina, composition of, 77. 
Sap, on the ascent and motion of the, 
481. 
Scheerer (Prof.) on the dimorphism of 
sulphur, 54. 
Schiel (M.) on sanguinarina, 77. 
Schenbein (Prof. C. F.) on the theory of 
the gaseous voltaic battery, 165. 
Ships’ cargoes, on the variation in the 
gravity of, 503. 
Silicite, composition of, 190. 
Silurian rocks, account of researches con- 
cerning the, 514. 
Silver, on the coloured rings produced by 
iodine on, 94; method of obtaining 
pure, 283. 
Soda, acetate of, with nine atoms of water, 
74. 
Solar spectrum, action of the rays of the, 
on vegetable colours, 5, 107, 135, 170, 
246; on the Daguerreotype plate, 120 ; 
on the parathermic rays of the, 505. 
Spectral appearances, on an instantaneous 
means of producing, 161. 
Spermatozoa, occurrence of, within the 
ovum, 415, 
Staffordshire, South, on the igneous rocks 
of, 524, 
Stark (Dr. J.) on the nerves, 483. 
Static electrical inductive action, remarks 
on, 200. : 
575 
Steam, efficacy of, in the production of 
electricity, 1, 267, 486, 570. 
Stearite from Snarum, analysis of, 
372. 
Stenhouse (Dr. J.) on pyrogallic acid and 
some of the astringent substances which 
yield it, 279, 417. 
Stokes (G. G.) on rectilinear fluid motion, 
55, 105. 
Sugar, on the manufacture of, from Zea 
Mays, 323. 
Sulphates and chromates of the potash 
family, on the, 339. 
, double, observations on some, 
343. 
Sulphocyanide of potassium, decomposi- 
tion of, by chlorine and nitric acid, 53. 
Sulphur, on the dimorphism of, 54. 
Sumach, chemical examination of, 420. 
Sun, total eclipse of, on July 8, 1842, on 
the, 386, 391. 
Sutherland (Dr. J.) on the origin and pro- 
gression of glaciers, 232, 495. 
Talbot (H. F.) on the coloured rings pro- 
duced by iodine on silver, with remarks 
on the history of photography, 94; on 
the iodide of mercury, 297. 
Tannin, action of muriatic acid on, 422. 
Tetracaulodon, remarks on the, 56, 226; 
561. 
Thomson (Prof. T.) on some new minerals, 
188. 
Tide observations at Tahiti, 488. 
Tilley and Francis’s notices of the inves- 
tigations of continental chemists, 52. 
Tin, on the form of the crystals of, 263. 
Tithonographic spaces in the solar spec- 
trum, on a new system of, 360. 
Tithonotype, or art of multiplying Da- 
guerreotypes, 365. 
Tithonicity, observations on, 270. 
Tornado, Providence, on the evidence of 
a general whirling action in the, 38. 
Trilobites and Agnosti, on the occurrence 
of, in the lowest shales of the paleeozoic 
series, 384. 
Turmeric, action of light on, 107. 
Valonia, chemical examination of, 424. 
Vener aqueous, on the force of, 73, 
157. 
Vapours, on the detithonizing power of 
certain, 161. 
Verneuil (M. de) on the fauna of the pa- 
lzozoic rocks, 522. 
Viola odorata, action of light on the colour 
of, 112. 
Vélckel (M.) on perhydrosulphocyanic 
acid, 52; on the decomposition of sul- 
phocyanide of potassium by chlorine in 
the presence of water, 53. 
Voltaic action, on some new cases of, 427, 
Voltaic battery, observations on the con- 
