INDEX. 



729 



Photochemical researches (PartV.), 306. 



Polar umbrae, on a theorem relating to, 

 563. 



Polarized light, reflexion of,from polished 

 surfaces, 168. 



Pollock (Sir F.) on Fermat's theorem 

 of the polygonal numbers (second 

 communication), 205, 713. 



Poly-ammonias, notes of researches on : 

 No. XX., 2 ; No. XXI., 312 ; No. 

 XXII., 389 ; No. XXIII., 576 ; No. 

 XXIV., 639. 



Polyedra, applications of the theory of, 

 341. 



Prestwich (J.), theoretical considera- 

 tions on the conditions under which 

 the drift deposits containing the re- 

 mains of extinct mammalia and flint 

 implements were accumulated j and 

 on their geological age, 38. 



on the loess of the valleys of the 



South of England, and of the Somme 

 and the Seine, 170. 



Prince of Wales elected a Fellow, 429. 



Probabilities, on the theory of, 179. 



Projectiles, experiments with eccentric 

 oblate bodies and discs, 17. 



Propylene gas, action of chloride of 

 iodine on, 278. 



Quekett (J.T.), obituary notice of, xxv. 

 Quinidine, on, 491. 



Bail way trains, experiments on the vibra- 

 tions occasioned by, in a tunnel, 630. 



Rankine (W. J. M.) on the exact form 

 and motion of waves at and near the 

 surface of deep water, 275. 



Reflecting telescope for the southern 

 hemisphere, remarks on, 284. 



Rigidity of the earth, 103. 



Roberts (W.) on peculiar appearances 

 exhibited by blood-corpuscles under 

 the influence of solutions of magenta 

 and tannin, 481. 



Robinson (Rev. T.R.) on the spectra 

 of electric light as modified by the 

 nature of the electrodes and the me- 

 dia of discharge, 202. 



Royal Medal awarded to, 295. 



Rosaniline, 5. 



, action of reducing agents upon, 9. 



Roscoe (H.E.),photochemicalresearches : 

 Part V. on the measurement of the 

 chemical action of direct and diffuse 

 sunlight, 306. 



on the measurement of the che- 

 mical brightness of various portions 

 of the sun's disc, 648. 



Ross (Sir J. C.), obituary notice of, Ixi. 



Royal Medal awarded to Rev. Dr. Ro- 

 binson, 295 ; to A. W. Williamson, 

 297. 



Rubia mwnjista, preliminary notice of 

 an examination of, 633. 



Rumford Medal awarded to G-. R. Kirch- 

 hoff, 291. 



Russell (W.H.L.) on the calculus of 

 symbols (third memoir), 184. 



Sabine (E.), results of the magnetic 

 observations at the Kew observatory, 

 from 1857 to 1862 inclusive : No. I., 

 623 ; No. II., 625. 



Savory (W. S.), experiments on food, 

 its destination and uses, 121. 



Schlaffli (Dr.), distribution of the sur- 

 face of the third order into species, in 

 reference to the absence or presence 

 of singular points, and the reality of 

 its lines, 327. 



Schlagintweit (H. de), numerical ele- 

 ments of Indian meteorology (Series 

 L), 567. 



Sea-water, constitution of, at different 

 depths and in different latitudes, 129. 



Selenography, sketch of the progress of, 

 31. 



Simpson (M.) on the synthesis of tri- 

 basic acids (preliminary notice), 236, 

 271. 



on the action of chloride of iodine 



on iodide of ethylene and propylene 

 gas (second notice), 278. 



on the direct transformation of 



iodide of allyle into iodide of propyle, 

 533. 



Skew-surfaces, otherwise scrolls, on, 447. 



Skulls, distorted, found at Wroxeter, 149. 



Stnee (A. H.) on the artificial produc- 

 tion of fibrin from albumen, 399 ; 

 Postscript, 505. 



Smith (R. A.) on the absorption of gases 

 by charcoal (No. I.), 424. 



Soane Museum, election of Sir P. Eger- 

 ton as trustee of the, 281. 



Sorby (H. C.) on the direct correlation 

 of mechanical and chemical forces, 

 538. 



South (Sir J.), experiments made at 

 Watford, on the vibrations occasioned 

 by railway trains passing through a 

 tunnel, 630. 



Spectra of fixed stars, note on the lines 

 of, 44 4. 



, m etallic and other, obtained by 



means of the electric spark, on the 

 photographic effects of, 159. 



Spectroscope, description of a large, 536. 



Spectrum analysis, on, 536. 



