INDF.X. 39.') 



Coal-gas retorts, artificial plumbago in, 159. Estimate of the 

 force of the explosion of, 278 — 282 



Cold, produced by the evaporation of liquids, experiments and 

 observations on, 294 — 297 



Comet, triennial, re-discovery of, 132 — 134. Notice of a new 

 comet, 168 



Copper, experiment on the sulphuret of, 150. Process of re- 

 fining; or toughening it, 156. Action of ammoniacal gas on, 

 157 



Creation, Mosaic account of, explained, 116 — 118 



Cruvi (M.) important points by, in the chemical history of In- 

 digo, 152—154 



Crystalline Forms of artificial salts, observations on, 282 — 288 



Curvature of the arches of the bridge of the Holy Trinity at 

 Florence, observations on, 1 — 8 



Cyanogen, experiments on a crystalline matter formed in the 

 solution of, 302, 303 



Cyanurets, production of, 381 



D 



Deluge, Mosaical account of, elucidated, 118 — 126 



Density of water, maximum of, 372 



Despretz (Ces.) experiments of, on the density of vapours, 297 



Diabetes, singular case of, 386 



Didot (M.) process of, for casting new stereotype plates, 138 



Dobereiner's apparatus for making extracts, notice of, 162 



Dryness of air or gases, test of, 160 



Dry-rot, experiment for preventing, 141 



E 



Elaine, separation of, from oils, 384 



Electricity of a cat, instance of, 163. Produced by pressure, 

 368. Developement of, by two pieces of the same metal, 369 

 Electro-magnetism, new experiments in, 374 

 Encke's triennial comet, re-discovery of, 132 — 134 

 Engine-boilers, observation on the feeding of, 137, 138 

 Eruption of Vesuvius in October, 1822, described, 175 — 183 

 J?a;creff*en<s of serpents, analyses of, 319 

 Explosion of coal-gas, estimate of the force of, 278 — 282 

 Extracts, notice of an apparatus for, 162 



F 



Falling Stars, theory of, 391 



Faraday (M.) experiments of, on the hydrate of chlorine, 71 — 



74. Condensation of gases into liquids by him, 74; 163. 



Historical statement respecting electro-magnetic rotation, 



288—292 

 Filberts, fertilization of the female blossoms of, 107 



