INDEX. 



591 



Plattner (M.) on enargite, 411. 



Plucker (Prof.) on the magnetic axes 

 of crj'stals, 447. 



Poisson (M.) on magne-ciystallic 

 action, 185. 



Polarization by caoutchouc and gutta 

 percha, 262. 



Porcelain, on amethodof gikling,518. 



Potter (Prof.) on the solution of the 

 problem of souud, 101, 30/, 319, 

 408, 475 ; on hydrodynamics, 205. 



Powell (Rev. B.) on the rotation of 

 the earth, 561. 



Probabihties, on the theory of, 353, 

 458, 521. 



Product of a line and a force, on the 

 interpretation of the, 394. 



Pyrosoma, on the anatomy and phy- 

 siology of, 504. 



Quadiatic functions, on the relation 

 between the minor determinants of 

 linearly equivalent, 295, 415. 



Quadratics of the fifth order, on the 

 solution of, 413. 



Quetelet (M.) on atmospheric elec- 

 tricity, 329. 



Rainey (G.) on a muscle of the striped 

 variety, 421. 



Rain, on an extraordinai-y fall of, in 

 the neighbourhood of London, 506. 



Rankine (W. J. M.) on Laplace's 

 theory of sovmd, 225 ; on Poisson's 

 investigation of the theory of sound, 

 410; on the vibrations of plane 

 polarized light, 441 ; on the law 

 of the comi)ressibility of water, 

 548. 



Raphilite, analysis of, 326. 



Retinalite, analysis of, 327- 



Retina, on .>;ome new and curious ap- 

 plications of the permanence of im- 

 pressions on the, 531 . 



Robertson (A. J.) on the negative wave 

 of translation, 192. 



Rose (G.) on a mass of meteoric iron, 

 517. 



Rose (Prof. H.) on some properties 

 and the estimation of boracdc acid, 

 257 ; on the separation of the prot- 

 oxide and peroxide of cop])er, 518. 



Rotation, on the geometrical theory' 

 of, 187. 



Royal Institution of Great Hi'ilaiii. 

 proceedings of tiic, 428, 508, 5(il . 



Royal Society, proceedings of the, 

 68, 167, 2l'3, 3."-l9, 420, 498. f,<\H. 



Rubian, observations on, 425. 



Rubiretine, 427. 



Sabine (Lieut. -Col.) on the periodical 

 laws of magnetic disturbances, 498. 



Safety-lamp, on the original model of 

 the, 167. 



Salmon (W. R. D.) on preparing pho- 

 tographic paper, 437. 



Salpa, on the anatomy and physiology 

 of, 504. 



Sandberger (F.) on carmine spar, 242. 



Seheerer (Th.) on the equivalent of 

 magnesium, 170. 



Schlagintweit (Prof. H.) on the dis- 

 tribution of temperature in the Alps, 

 247 



Schunck(E.)onrubian and itsproducts 

 of decomposition, 425. 



Scoparine, preparation and constitu- 

 tion of, 246. 



Sea-weeds as the sources of acetic 

 acid, on, 24 ; occurrence of butyric 

 acid in, 25. 



Smith (Dr. J. L.) on ephesite, 160; 

 on pholerite, 1 6 1 ; on emerylite, 412. 



Solar eclipse of 1851, July 28, on the 

 total, 508. 



Solar light, on the polarization of 

 the chemical rays which exist in 

 515. 



Sound, on the solution of the problem 

 of, 101, 225, .305, 317, 319, 332, 

 405, 408, 410, 475, 560. 



Sparteine, preparation and constitution 

 of, 246. 



Spinal cord, on the structure of the, 

 243. 



Stars, results of observations of the 

 positions and distances of nineteen, 

 254; on the distribution of the fixed, 

 521. 



Statics, symbolical, on, 491. 



Steam, on the efifect of fluid friction 

 in drying, 474. 



Stenhouse (Dr. J.) on sea- weeds as 

 the sources of acetic acid, 24 ; on 

 the action of nitric acid on various 

 vegetables, 245. 



Stokes (Prof. G. G.) on tlie alleged 

 iiecessity for a new general equation 

 in liydmdyiianiics, 157, 393 ; on the 

 possible ert'cct of the nidiation of 

 heat on the i)ropagati()n of sound, 

 .'i05; on the effect of tiic internal 

 friction of fluids on the motion of 

 pciididums, .■(.'<7. 



