INDEX. 



551 



tion of, by their opticafproperties, 

 388. 

 Oxygen, on the difference between 



active and ordinary, 261. 

 Ozone, on the tests for, 229 ; obser- 

 vations on, 261. 

 Paranitrobenzoic acid, 112. 

 Pnrathionic acid, researches on, 218. 

 Persoz (M.) on the constitution and 

 properties of the oxygen com- 

 pounds of tungsten, 496. 

 Phosphorus, on a cyanogen com- 

 pound of, 497- 

 Photographic prints, on the yellow 



coloration of faded, 546. 

 Piperidine, researches on, 113. 

 Polyhedral frames, on the principle 



of the equilibrium of, 92. 

 Potter (Prof.) on the theory of the 



velocity of sound, 104. 

 Propyle compounds, researches on, 



108. 

 Pyroxyline-paper, on the electrical 



properties of, 240. 

 Quadric surface, analytical theorem 



relating to the sections of a, 43. 

 Quincke (G.) on the optical proper- 

 ties of the metals, 161 ; on the re- 

 fractive index of the metals, 432. 

 Rankine (Dr. W. J. M.) on the prin- 

 ciple of the equilibrium of polyhe- 

 dral frames, 92 ; on the dynamical 

 theory of heat, 194; on the hypo- 

 thesis of molecular vortices, 313. 

 Reboul (M.) on the preparation and 



properties of valerylene, 501. 

 Reich (P.) on indium, 199. 

 Reusch (Prof.) on some properties of 



ice, 192. 

 Richter (T.) on indium, 199. 

 Riess (P.) on the deflection of the 

 magnetic needle by the secondary 

 currents of the Leyden battery, 

 313. 

 Rock-salt, on the passage of radiant 



heat through, 396. 

 Rodwell (G. F.) on some effects pro- 

 duced by a fluid in motion, 36. 

 Roscoe (Prof. H. E.) on the chemical 



brightness of the sun's disc, 384. 

 Royal Institution, proceedings of the, 



299, 388. 

 Royal Society, proceedings of the, 68, 



143, 229, 382, 467, 539. 

 Saint-Robert (Count Paul de) on a 

 barometrical formula resulting from 



observations made by Mr. Glaisher 

 in eight balloon ascents, 132; on the 

 measurement of heights by the ba- 

 rometer, and on atmospheric refrac- 

 tion, 401. 

 Saytzeff (M.) on the action of hydri- 



odic acid on anisic acid, 111. 

 Schacht (M.) on monosulpholactic 



acid, 505. 

 Schiel (M.) on bromocarbonic acid, 



499. 

 Schmitt(M.) on the action of bromine 



on cinnamic acid, 110. 

 Schwanert (M.) on the action of nitric 



acid on camphor, 503. 

 Secchi (A.) on the intensity of solar 

 radiation in different seasons, 237 ; 

 on Kirchhoff's theory of solar spots, 

 440. 

 Silliman (B., jun.) on the electrical 

 properties of pyroxyline-paper, 240. 

 Solar radiation, on the intensity of, in 

 different seasons, 237. 



spots, on Kirchhoff's theory of, 



440. 



system, on the traces of a spiral 



structure in the, 190. 

 Sorby (H. C.) on the direct correla- 

 tion of mechanical and chemical 

 forces, 145. 

 Sound, on the velocity of, in air and 



gases, 1, 41, 92, 98, 104. 

 Spectra of some of the chemical ele- 

 ments, on the, 541. 

 Spectrum, on the rays of the ultra- 

 violet solar, 1.59. 

 Spectrum-analysis, researches on, 143. 

 Stefan (J.) on the theory of gases, 75. 

 Stereoscopic relief in the Chimenti 



pictures, on the, 33. 

 Stewart (B.) on the magnetic disturb- 

 ance of Dec. 14, 1862,471 ; on the 

 temperature of the freezing-point 

 of mercury, 475. 

 Stokes (Prof. G. G.) on the discrimi- 

 nation of organic bodies by their 

 optical properties, 388. 

 Strecker (M.) on a new class of ni- 

 trogen compounds, 501. 

 Studer (Prof. B.) on the origin of the 



Swiss lakes, 481. 

 Sun, on deducing the parallax of the, 

 50; on the telescopic appearance 

 of the exterior envelope of the, 156, 

 306 ; on the constitution of the, 

 376 ; on the nature of the magnetic 



