INDEX. 
Forbes’s (Prof.E.) geological investigations 
in the Mediterranean, notice of, 515. 
Fossils, paleozoic, account of some, 322. 
Fownes (Dr. G.) on the analysis of organic 
substances containing nitrogen, 317. 
Francis and Tilley’s notices of the inves- 
tigations of continental chemists, 52. 
Francis (Dr. W.) on the presence of nitro- 
gen in picrotoxine, with remarks on the 
determination of nitrogen in organic 
analysis, 320. 
Fremy (M.) on certain metallic acids, 
413, 496. 
Galvanometer, experiments on the, 435. 
Gases, on the detithonizing power of, 
161. 
Geological Society, proceedings of the, 56, 
226; address of the president, 511. 
Geology :—on the Missourium and Tetra- 
caulodon, 56; on rock basins of South- 
ern India, 62 ; on some geological pha- 
nomena, 65 ; on the coal-fields of Penn- 
sylvania and Nova Scotia, 66; on the 
black earth of Central Russia, 71; of 
Egypt, 215; on Tetracaulodon, 226 ; 
on the origin and progression of glaciers, 
232; on rocks and veins forming the 
opposite walls of cross veins, 373, 443 ; 
occurrence of Trilobites and Agnosti in 
the lowest shales of the palzozoic series, 
384, 
Geometry of coordinates, on some theorems 
in the, 353. 
Glaciers, on the origin and progression of, 
232; on the theory of, 495. 
Gold, native, remarkable occurrence of, 
499. 
Graham (Prof. T.) on the heat disengaged 
in combinations, 329. 
Grant (Prof.) on the genus Tetracaulodon, 
561. 
Gregory (Dr. W.) on a new method of 
obtaining pure silver, 283. 
Grove (W. R.) on the voltaic battery, 32. 
Guaiacum, action of the solar rays on a 
solution of, 7. 
Gymnite, composition of, 191. 
Hall (C. R.) on the structure and mode of 
action of the Iris, 487. 
Hansen (Prof.) on a new method of com- 
puting the perturbations of planets, 229, 
Hare (Dr.) on the chemical and contact 
theories of the voltaic battery, 268; on 
the electrolysis of salts, 461. 
Haughton (Sir G. C.) on some experi- 
ments in electricity, 208, 265, 435. 
Heat, on the theory of, 21, 22. 
, chemical, on the electrical origin of, 
204, 329. 
Hennell (Mr.), notice of the late, 153. 
Henwood (W.J.) on the appearances and 
relative positions of the rocks and veins 
573 
which form the opposite walls of cross 
veins, 373, 443. 
Herschel (Sir J. F. W.) on the action of 
the rays of the solar spectrum,on vege- 
table colours, and on some new photo- 
graphic processes, 5, 107, 135, 170, 246, 
505; on the Daguerreotype plate, 
120. 
Hexagon inscribed in a conic section, de- 
monstration of Pascal’s theorem relative 
to the, 168. 
Himly (M.) on a new method of precipi- 
tating metals in the state of sulphurets, 
237. 
Hochstetter (C.) on the composition of 
several mineral substances, 370. 
Hunt (R.) on the changes which bodies 
are capable of undergoing in darkness, 
and on the agent producing these 
changes, 270. 
Hydrotalcite, analysis of, 371. 
Invertebrata, on the structure of the hard 
parts of the, 484. 
Iodine, on the coloured rings produced by, 
on silver, 94, 
Iris, on the structure and mode of action 
of the, 487. 
Iron pyrites, manufacture of sulphuric 
acid from, 496. 
Ivory (J.), notice of the late, 142. 
Jacobi (M.), remarks on the theory of el- 
liptic functions of, 258, 358. 
Jeffersonite, composition of, 193. 
J. J. on the effect of the variation of gra- 
vity of ships’ cargoes in different lati- 
tudes, 326. 
Jones (J. W.) on blood-corpuscles and 
fibre, 480. 
Joule (J. P.) on the electrical origin of 
chemical heat, 204; on Sir G. C. Haugh- 
ton’s experiments in electricity, 265, 
435. 
Kakodylic acid, 180. 
Kelland (Rey. P.) on the theory of mole- 
cular action, 21, 22, 116, 194. 
Keyserling (Count A.) on the geology of 
Russia, 527. 
Knorr (M.) on invisible light, 325. 
Koch (Mr.) on the genus Tetracaulodon, 
226. 
Lambert (A. B.), notice of the late, 148. 
Lead, native, occurrence of, in Ireland, 
234. 
Lewy (M.) on the composition of paraf- 
fine, 235. 
Light, on the theory of the dispersion of, 
21, 22, 116, 399, 492; on an apparatus 
for the circular polarization of, 241,262; 
latent, observations on, 270. 
, invisible, observations on, 325. 
, on the elliptic polarization of, 485. 
Lightning, memoir on, 490, 
