INDEX TO VOL. VI 



A. BEL'S theorem, on some elemen- 

 tary applications of, 1 1 6. 



Achromatism of the eye, 161, 247. 



Acids: — hydrocyanic, 97; sulphuric, 

 97; titanic, 113, 201; arsenious, 

 237; gallic, 319; formic, 399. 



Acoustics, on the production and pro- 

 pagation of sound, 25. 



Adam ( Dr. W.) on human osteology, 57. 



Addams (R.) on the repulsive action of 

 heat, 415. 



Agassiz (M.) on Lepisosteus, 384. 



Alkalies, vegetable, ammonia in, 78. 



Allanite, analysis of, 238. 



Alloys of iron and copper, 81. 



Ammonia, in the vegetable alkalies, 78 ; 

 muriate of, its action on certain sul- 

 phates, 235. 



Analyses :— employment of insoluble 

 salts in, 79 ; of osmiridium and al- 

 lanite, 238 ; of a mineral water from 

 the island of St. Paul, 3 1 2. 



Animals, on the structure of, 4, 90. 



Apjohn (Dr. J.) on the dew-point, 183. 



Architecture, Gothic, progress of, 395. 



Argonauta, on the animal of, 385. 



Arsenious acid, peroxide of iron an an- 

 tidote to, 237. 



Astronomical Society, 221, 305, 449. 



Astronomy: — Dr. Olbers on the return 

 of Halley's comet, 45 ; astronomical 

 refractions, 142; Dr. Halley's astro- 

 nomical observations, 22 1 ; some par- 

 ticulars of the life of Dr. Halley,306; 

 an equal altitude instrument, 449; 

 letter from Sir John Herschel, dated 

 Cape of Good Hope, 450. 



Atmosphere, composition of the, 319. 



Aurora Borealis, nature and origin of, 

 59 ; seen at Woolwich, Dec. 22, 230. 



Austen (A.C.) on the raised beach near 

 Hope's Nose, Devonshire, 63. 



Baily ( F. ), account of the astronomical 

 observations made by Dr. E. H alley, 

 at the Observatory, Greenwich, 221. 



Barytes and strontia, hydrates of, 52. 



Baryto-calcite, dimorphism of, 1. 



Bats, habits and oeconomy of, 388. 



Beke (C. T.) on the advance of the land 

 in the Persian Gulf, 401. 



Bennett (G.), natural history and habits 

 of the Omiihorhi/nchus paradoxics,307 . 



Benson (Mr.) on the importation of the 

 living Cerilhium Telescopium, 70. 



Bentham (G.) on the genus Hosackia 

 and the American Lotiy 221 ; on the 

 ErwgoneeCj 379. 



Bird (G.) on the existence of titanic 

 acid in Hessian crucibles, 1 1 3. 



Birds of passage, arrival of, 424, 



Bishop (J.) on the causeof the graveand 

 acute tones of the human voice 372. 



Bismuth and cadmium, separation of 

 the oxides of, 235. 



Blackburn (C), analytical theorems re- 

 lating to geometrical series, 196. 



Blood, its circulation in insects, 300; 

 titanic acid in, 201. 



Blue colours, preparation of, 156. 



Bostock (Dr.), analysis of a mineral wa- 

 ter from the island of St. Paul, 312. 



Botany : — a newly observed property in 

 plants, 164; on (he ^enxxs Hosackia 

 and the American Loti, 221 ; on the 

 classification of vegetables, 579 ; on 

 the Eriogoncce, 379 ; on the species 

 of Feclia, 380. 



Brayley (E. W.) on the distribution in 

 the animal kingdom of the powers of 

 producing heat and light, 241. 



Brett ( R. H. ) on the existence of titanic 

 acid in Hessian crucibles, 113. 



Brewster (Sir D.), notice of a new mi- 

 neral, 133; on the achromatism of the 

 eye, 161, Prof. Powell in reply to, 

 247 ; on peculiarities in the double 

 refraction and absorption of light, ex- 

 hibited in the oxalate of chromium 

 and potash, 305. 



Broderip (W.J.) on Clavagella, 381. 



Bromine, proportion of, in the waters 

 of different seas, 321. 



Brooke (H. J.), mineralogical notices, 

 76.^ 



Cadmium and bismuth, separation of 

 the oxides of, 235. 



Cambridge Philosophical Society, 73, 

 395. 



Cantharidine, preparation of, 319. 



Carbonate of strontia discovered in the 

 United States, 234. 



Carbonic oxide, on Prof. Mitchell's me- 

 thod of preparing, 232. 



Cauchy's (M.) view of the undulatory 

 theory of light, Prof. Powell's abs- 

 tract of, 16, 107, 189, 262. 



Caustics, equations of, 372. 



Challis ( Rev. J. ) on the analytical de- 

 termination of the laws of transmitted 

 motion, 267. 



Cirripedes, metamorphosis of the, 373. 1 



Clarke (E. M.) on a new phsenomenon 

 in magneto-electricity, 169; on cer- 

 tain optical effects of the magneto- 

 electrical machine, 427 ; apparatus 

 for the decomposition of water, 428. 



Clavagella, description of, 230, 881. 



Coal tracts, in Salop, Worcestershire, 

 and N. Gloucestershire, 376. 



Cobalt blue colours, 157. 



Comet, Halley's, on the return of, 45. 



Compass-needles, improved, 238. 



Copper, fusion and appearance of, 324 ; 

 its immersion in muriatic acid, 446. 



Copper and iron, alloys of, 81. 



Cotton, on the fibres of, 170, 231. 



Cuming (Mr.), new species of shells 

 from South America, 68, 387. 



