INDEX. 



5«& 



Forbes (J. D.) on the classification of 

 colours, 161. 



Forces, analytical proof of the paral- 

 lelogram of, 201. 



Forster (Dr.) on the weather after a 

 new moon, 21 G. 



Foucault (M. L.) on some pha;nomena 

 of binocular vision, 269. 



Functions, on the decomposition of, 

 into conjugate factors, 278. 



• , elliptic, on the application 



of the theory of, to the rotation of 

 a rigid body round a fixed point, 

 312. 



Geometrical problems, solution of 

 two, 132. 



Gilliss (Lieut.) on the longitude of 

 Washington, 150. 



Glaisher (Jas.) on the weather during 

 the quarters ending December 31, 

 1848, 182; and March 31, 1849, 

 366 ; on the meteorology of Eng- 

 land in the year 1847, 271, 



Gold from California, on the compo- 

 sition of the, 205, 394. 



Graves (Rev. C.) on the calculus of 

 operations, 60 ; on a system of tri- 

 ple algebra, 119. 



Grove (W. R.) on the effect of sur- 

 rounding media on voltaic ignition, 

 299. 



Gyrophoric acid, on the preparation 

 and composition of, 464. 



Hamilton (Sir W. R.) on quaternions ; 

 or on a new system of imaginaries 

 in algebra, 294, 340, 425. 



Hare (Dr.) on the rationale of the ex- 

 plosion causing the great fire of 

 1845 at New York, 227. 



Hartnup (Mr.) on the transit of Mer- 

 cury, 143 ; on the equatoreal of the 

 Liverpool Observatory, 148. 



Heart, on the ganglia and nerves of 

 the, 304. 



Heat, on the reflexion of different 

 kinds of, by metals, 471. 



Heath (Rev. J. M.) on a simple rule 

 for converting intervals of sidereal 

 into intei-vals of mean solar time, 

 and vice versa, 51. 



Heineken's (N. S.) suggestions for 

 rendering a meridian mark visible 

 at night, 202. 



Henry (T. H.) on the composition of 

 the gold from California, 205. 



Herapath (T. J.) on some combina- 



tions of boracic acid with oxide of 



lead, 374. 

 Herschel's (Sir J. F. W.) Outhnes of 



Astronomy, noticed, 452. 

 Huraut (M. T.) on the preparation of 



iodide of lead, 231. 

 Hydrogen, on the peculiar cooling 



effects of, in cases of voltaic igni- 

 tion, 304. 

 Irradiation, observations on, 469. 

 Jones (Dr. H. B.) on the chemistry of 



the urine, 311. 

 Kemdt (M.) on felsite, oligoclase and 



muromontite, 237. 

 Klauer (M.) on the rectification of 

 . spirit of nitrous aether, 319. 

 Lassell (Mr.) on a machine for pohsh- 



ing specula, 143. 

 Lead, on the preparation of the iodide 



of, 231. 

 Lee (Dr. R.) on the ganglia and 



nerves of the heart, 304. 

 Lichens, on the proximate principles 



of some, 463. 

 Light, on a theory of the transmission 



of, through transparent media, 225. 

 Lizaric acid, on the preparation and 



composition of, 236. 

 Locke (J.) on single and double vision, 



and on an optical illusion, 195. 

 Longitude, method of detennining 



differences of, 302. 

 Loomis (E . ) on the determination of the 



difference of longitude, by means of 



the magnetic telegraph, 302. 

 Louyet (M.) on the equivalent of 



fluorine, 150. 

 Lowe (E. J.) on remarkable solar 



halos and mock suns, 410. 

 Luminous vibrations, on a mathemati- 

 cal theory of, 225. 

 Madder, examination of, 236. 

 Magnecrystallic force, on the nature 



of the, 7^- 

 Magnet, on the repidsive action of a 



pole of a, upon non-magnetic bo- 

 dies, 127. 

 Magnetic declination, on the causes 



which produce the diurnal varia- 

 tion of the, 466. 

 Magnetic needle, on the cause of the 



diurnal variations of the, 286, 344 ; 



on the deflection of the, by the act 



of voUtion, 543. 

 Magnetic polarization, observations 



on, 481. 



