430 
INDEX. 
C. 
Calculous concretions. Sequel to Dr. Yelloly’s paper on Calculous concretions, 415. 
Camelopard. On its stomach, 85. 
Cape of Good Hope. Observations with an invariable pendulum for the purpose of deter- 
mining the compression of the earth, 153. 
Chagres. Relative height of the Pacific and Atlantic Ocean, at Panama and the river 
Chagres, 59. 
Colours ( complementary ) produced by successive reflexions from the polished surfaces of 
metals, 309. 
Compression of the earth. Experiments to determine it, made with the pendulum at the 
Cape of Good Hope, 153. 
Conducting powers of metalliferous minerals, 402. 
Cornwall ( steam-engines in). Progressive improvements made in them, 121. 
( mines in). Electro-magnetic properties of their metalliferous veins, 399. 
Correction for variations of temperature in the invariable pendulum, 251. 
D. 
Daniell (J. Frederic, Esq. F.R.S.). On a new register-pyrometer, for measuring the 
expansions of solids, and determining the higher degrees of temperature upon the 
common thermometric scale, 257. 
Daubeny (Charles, M.D. F.R.S.). On the occui-rence of iodine and bromine in certain 
mineral waters of South Britain, 223. 
Dollond (Mr.). Scale of linear measure, 371. 
Double refraction. Production of, in the molecules of bodies by simple pressure, 87. 
Drummond (Lieut. Thomas). On the illumination of light-houses, 383. 
Dulong (M.). Correction of the formula representing the velocity of sound, derived from 
his experiments on the specific heat of gases, 209. 
E. 
Earth. Its compression estimated from experiments with the pendulum at the Cape of 
Good Hope, 153. 
Elasticity of threads of glass applied to torsion balances, 215. 
Electro-magnetic properties of metalliferous veins in the mines of Cornwall, 399. 
Elliptic polarization. On its phenomena and laws, as exhibited in the action of metals upon 
light, 287. 
Error in standards of linear measure arising from the thickness of the bar on which they are 
traced, 359. 
Expansions of solids. On a new register-pyrometer for measuring them, 257. 
