INDEX. 



Pyroxeue, ou a peculiar variety of, 

 "501. 



Quaternions, on some extensions of, 

 492. 



Quet (M.) on the magnetism of li- 

 quids, 529. 



Rankine (W. J. ]M.) on the mecha- 

 nical action of heat, 1, 111, 172, 

 239 ; on the geometrical represen- 

 tation of the expansive action of 

 heat, and the theory of thermo-dy- 

 namic engines, 288. 



Reade (Rev. J. B.) on some early 

 experiments in photography, 326. 



Retina of the human eye, ou some of 

 the circumstances and principles 

 which regulate the production of 

 pictures on the, 218. 



Riess (P.) on the generation of heat 

 by electricity, 348, 428. 



Riile bullets, on some experiments to 

 determine the velocities of, 390. 



Rocks, ou the decomposition of, by 

 snli)hurous waters, 6S ; action of 

 alkalies upon, 100 ; on the natural 

 classification of igneous, 300. 



Rosse (Earl of J, anniversary address 

 of the, to the Royal Society, 57. 



Rotating bodies, on an apparatus for 

 the illustration of various phaeno- 

 mena of, 272, 291, 398. 



Roxburgh (Dr. W.) on the Cartesian 

 barometer, 410. 



Ro}al Institution of Great Britain, 

 proceedings of the, 223, 291, 372. 



Royal Society, proceedings of the, 

 51, 142, 218, 287, 358. 437, 515; 

 anniversary address of the Presi- 

 dent, 57. 



Ruhmkorff's induction coil, on some 

 experiments made with, 97- 



Sabine (Col. E.) on the intiuence of 

 the moon on the magnetic direction, 

 52. 



Savart (F.) on some acoustic pha;no- 

 mena produced by the motion of 

 liquids through short efflux tubes, 

 186. 



Scoresby (Rev. W.) on the production 

 of pictures on the retina of the hu- 

 man eye, 218. 



Scrugham (Mr.) on some new com- 

 pounds of phenyle, 370. 



Sc'narmont (M. de) on the nrtifieial 

 production of polychroisni in cry- 

 stallized substances, 228. 



Shells, fossil and recent, on the che- 

 mical composition of some, 335 ; 

 on the growth of land, 363. 



Siemens (M. W.) on some remark- 

 able phfeuomeua presented by sub- 

 terraneous electro-telegraph wires, 

 396. 



Silica, on some of the applications of, 

 to the arts, 375. 



Silicium, ou the electro-deposition of, 

 227. 



Silvester (Dr. T. H.) on the typical 

 forms of the large secreting orgrms 

 of the human body, 54. 



Smith (R.) on the detection of gold 

 in lead and its compounds, 126. 



Sj)crmatozoon, on the jjcnetration of 

 the, into the interior of the ovum, 

 346. 



Spheroidal state of bodies, on the, 

 275; of water in steam-boilers, 

 283. 



Spiller (J.) on a method for preser- 

 ving the sensitiveness of collodion 

 plates for a considerable time, 349. 



Spn-its, on the acidity, sweetness and 

 strength of, 143. 



Square numbers, on certain properties 

 of, 147, 287, 358. 



Steam, on the mechanical action of, 

 treated as a perfect gas, 1 72. 



Steam-boilers, on the spheroidal state 

 of water in, 283. 



Steam-engines, on the power and 

 cccouomy of single-acting expan- 

 sive, 239. 



Stenhouse (Dr. J.) on the dried coffee- 

 leaf of Sumatra, as a substitute for 

 tea or for the coffee-bean, 21 ; on 

 the crystalline deposit which forms 

 in oil of bitter almonds, 26 ; on 

 xanthoxyline, 28; on the crystal- 

 lizable princij)le in the bark of the 

 Fraxinus excelsior, 501. 



Storm-tracks of the South Pacific 

 Ocean, on the, 268. 



Sulphur, ou the melting-point and 

 transformations of, 439. 



Sulphuric acid, ou the decomposition 

 of, by peutacliloride of phosphorus, 

 365. 



Sulphurous waters, on the decom- 

 posing action of, n|uin rocks, {]S. 



Surfaces, on the tran.sibrnuition of, 

 by Ijciidiiig, 4 -J 9. 



Silvester (J. J.) ou a point of notn- 



