INDEX. 
Hydrocarbon , with sulphuric acid in oil of wine, 242 — analysis of, 
247. 
Hydrogen , its combination with chlorine effected by the light of 
incandescent lime, 333. 
Hydrosulphurets exert a powerful electrical action on copper, 395. 
Hygrometer , an improved, by Mr. Jones, described, 53. 
I 
Ice , elasticity of, determined, 304. 
Incrustations on ancient alloys, coins, &c. 57. 
Intensity of magnetism at Port Bowen, Part IV. p. 125 — of dipping 
and horizontal needles at ditto, compared, IV. p. 177. 
J 
Jones, Mr. Thomas, his description of an improved hygrometer, 53. 
K 
Kater, Capt. H. his account of the adjustment of new standard 
weights and measures of the United Kingdoms, 1. 
L 
La Canche, a station for signals made on the French coast, obser- 
vations of, 85. 
Lamblon, Colonel, an error pointed out in his estimation of the 
length of the French arc, 568. 
Lamp. Lieut. Drummond’s construction of one, yielding an intense 
light, 330. 
Largeteau, Lieut. C. L.,his observations of signals from Fairlight 
Down, 90. 
Life , human, its law of decrement, 281 — terms of according to 
different tables, 204. 
Light , bright, for geodastical signals, M. Fresnel’s, 329 — Lieut. 
Drummond’s ditto, 330. 
emitted by incandescent lime, its chemical effects, 333. 
Light-houses, a new mode of illuminating proposed, 335. 
Lime, its power of emitting a vivid light when intensely heated, 331. 
“flame” a particular kind of, excelling others in this power, 
332. 
Lithophagi, their mode of penetrating stone considered, 360 et seq. 
— proofs of their employing a solvent, 365. 
Longitudes, difference of how best determined by a series of cor- 
respondent observations of signals, 105. 
— between Greenwich and Paris determined, 
126 . 
