104 iNbEX. 



Hydrogen, preparation of, xvii. 1G4. Odour of, proved to be 

 extraneous, 380 



pure, process for obtaining, xviii. 180. Eruption of, 

 188. Decomposition of metallic sulphates by, 392 



Hydrometer, directions for using, v. 223 



observations on the construction and uses of, vi. 133 



Hydroparabolic mirror, notice of, xv. 137 



Hydrophobia, remedies for, v. 141. viii. 362. x. 194 



-— Alsima plantago used in, vi. 1 64 



on the use of chlorine in, xii. 190 



• excision of the bitten part, in what case an effec- 

 tual preventive of, xviii. 111. Remarks on the different plans 

 of treatment hitherto proposed, 112. Suggestions of Dr. Booth 

 for the treatment of this malady, 115. The hydrophobic poison 

 said to lose the power, after its first transmission, of conveying 

 the disease, 412 



Hydrostatic balance (new), notice of, ix. 388 



Hydrosulphuret of potash, preparation of, xvii. 165 



Hydroxanthic acid, preparation of, xv. 304. Account of its pro* 

 'ducts and combinations, 305 



Hygrometer (new), notice of, vii. 395 



— — for measuring the force and weight of vapours in the 



atmosphere, and the corresponding degree of evaporation, de- 

 scription of, viii. 298. Manner of using the instrument, 301. 

 Table of the force, density and expansion of aqueous vapour at 

 different degrees of temperature from 0° to 92°, 306. Obser- 

 vations thereon, 308. Table of the force of vapour, and the 

 full evaporating force of every degree of temperature from 28*^ 

 to 85**, 311. Observations thereon, 314. Table of their results, 

 322. Application of it to barometrical results, 323. Mete- 



. orological journal kept with it, 326 



— — — observations on the form of, ix. 128 



excellent, of Mr. Daniell, xiv. 185 



Hygrometric property of sulphuric acid, notice of, xx, 400 



Hyoscyamia, analysis of, xi. 205 



