INDEX. 403. 
* 202—209. On the adaptation of a compound microscope, to act 
. as a dyrameter for telescopes, 367—369 
Griffiths (Mr. T.) account of an electrical arrangement produced 
_ with the different charcoals and one conducting fluid, 174, 175 — 
Groombridge (Mr.) comparison by, of the new tables of refraction 
with observation, 100—103 
Guiana, the common, observations on, 255 
Hall (Capt. Basil) results of experiments made by, with an invari- 
able pendulum, 126 
Hancock (Mr.) process of, for preparing caoutchouc, 364 
Hare (Dr.) account of his single gold leaf electrometer, 378. And 
of his voltaic trough, 2bid. On the preparation of artificial cha- 
lybeate water, 380. On the combustion of iron by sulphur, 381 
Harvey (George, Esq.) observations on some phenomena, relating to 
the formation of dew on metallic surfaces, 1\—12. On the influ- 
ence of magnetism on chronometers, 179—202, 365—367. Ex- 
_ perimental inquiries by, relative to the distribution and changes 
of the magnetic intensity in ships of war, 261, 262. 
Harwood (Dr.) syllabus of his lectures on zoology, 286 
Hatching of fish, Chinese method of, 178 
Hayotte, advancement of the ground in the village of, 180, 181 
Henry (Dr.) remarks on the review of his Elements of Chemistry, in 
this journal, 131—134. On the action of finely-divided platinum 
on gaseous mixtures, and its application to, 277, 278 
Herschel (J. F.) analysis of the Bakerian lecture by, 256—259 
Herschel (J. F.) and South (James) observations by, on the apparent 
distances and positions of certain double stars, 250—253 ; 
Hill (Mr. P.) particulars by, relating to the ornithorhynchus paras 
doxus, 247—250 
Home (Sir Everard,) facts by, relative to the natural history of 
the walrus and seal, 262, 263. Account of the organs of gene+ 
ration of the Mexican Proteus in a developed state, 278, 279 
Hume (Mr.,) notice of his discovery of anew vegeto-ralkaline base, 
in Jalap, 386 
Hydrogen Gas, odour of, extraneous, 380 
Hydrogen, (sulphuretted,) preparation of, 164. Inflammation of, 
by nitrie acid, 379 
Hydro-sulphuret of potash, preparation of, 165 
Hysterical Patient, eflect of the injection of a solution of opium 
into the veins of, 145, 146 
Ice-caves, natural, account of, 396 
Immobility, a disease of horses, cause of, 145 
Insects, solution for destroying, 146 
Intermittents, prussiate of iron a remedy for, 145 
Todine discovered in mineral waters, 180 
Tron; action of sulphur on, 165. Experiments and observations on 
the developement of magnetical propertics in, by percussion, 
