376 INDEX. 



Civets experiments on, 164, 165 



Clement (M.), process of, for obtaining massive copper by the 



moist process, 154, 155 

 Coal found in Mexico, description of, 27, 2S 

 Collimator (floating), description of, 301-303 

 Colour, curious changes of, in the oxides of cobalt and zinc, 342 ; 



nature of, in mineral productions, ibidy 343 

 Comet of Encke, catalogue of the stars in, 119, 120 

 Compounds^ insoluble and difficultly soluble, hydrometric properties 



of, 92-96 

 Conductors of lightning, report on, 143-147 

 Conglomerate rocks, formation of, 208-212 

 Consolidation of rocks, 32-38 ; different rocks, and their modes of 



consolidation, 38-43 ; general causes of it, 43, 44 

 Constituents of rocks, 28-32 

 Copper, influence of, on magnetic needles, 147; massive copper 



obtained by the moist process, 154, 155 ; ammoniacal chromate 



of, 155 

 Cotton mill, new mode of warming, 137, 138 

 Cowley and Stains (Messrs.), English opium of, further account 



of, 141, 142 

 Crys^a/5 of sulphate of soda, composition of, 152,153; artificial 



crystals of chromate of lead, produced, 155; general method 



of calculating the angles made by any planes of crystals, 296-298 

 Cyanuret, experiments on the compound of, with nitrate of silver, 



159-161 



Davy (Sir Humphrey), researches of, on the preservation of 



metals by electro-chemical means, 271-273 

 Decolouring power of different substances, experiments on, 165 

 De la Rive (M.), observations of, on the voltaic pile and current, 



337, 338 

 Density of water, maximum of, 149 

 Diamond, best adapted for microscopic magnifiers, 133 

 Di^fe^^ion of ruminating animals, experiments on, 169-172 

 Distillation, experiments on the acceleration of, 149 

 Dobereiner (Mr.), observations and experiments of, on the com- 

 position, &c., of formic acid, 355-358 

 Dogs, experiment on feeding, with white and household bread, 



172 

 Dumeril (M.), report of, on the medicinal application of leeches, 

 174 



Earth, sketch of the different theories of, by Dr. Thomas Burnet, 

 65, 66 ; Dr. Woodward, 67, 68 ; Mr. Mitchell, 69 ; and Mr. 

 Whitehurst, 70 ; Neptunian theory of "Werner, 72-74; Plu- 

 tonic theory of Dr. Hutton, 74-76 j account of the earth's 



