INDEX. 



567 



Phosphorus, on the spectrum of, 416. 



Phvsics, on the principles of theore- 

 tical, 313. 



Potter (Prof.) on the relations of the 

 elastic force, density, and tempera- 

 ture in gases, 52. 



Pratt (Archdeacon J. H.) on Chinese 

 astronomical epochs, 1, 496; on 

 the undulation of an unstiffened 

 roadway in a suspension bridge as 

 a heavy train passes over it, 445. 



Probabilities, on the theory of, 352, 

 4/0. 



Propvlic alcohol, on the production 

 of, 474. 



Pterichthys, on a new species of, 243. 



Pyrometer, on a new, 537. 



Pyrotartaric acid, on the synthesis of, 

 326. 



Radiation, on the comparative effects 



, of, from the surface of the ground 



and over a large sheet of water, 9 ; 



on internal, in uniaxal crystals, 



328. 



Ramsay (A. C.) on the glacial origin 

 of certain lakes, 413. 



Rankine (W. J. M.) on a dew-bow 

 seen on the surface of mud, 245 ; 

 on the resistance to the conduction 

 of heat, 336. 



Regelation, observations on, 312, 407. 



Regnault (V.) on the specific heat of 

 some simple bodies, 103 ; on some 

 apparatus for determining the den- 

 sities of gases and vapours, 33/ ; on 

 a new method of measuring high 

 temperatures, 537. 



Rhodium, on the specific heat of, 110. 



Roberts (G. E.) on the carboniferous 

 limestone of Shropshire, 243. 



Robinine, on the preparation, proper- 

 ties, and composition of, 476. 



Rock salt, on the hygroscopic proper- 

 ties of, 249. 



Rodoszkovski (M.) on a new mineral 

 from the Ural, 1 60. 



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

 spectrum, and the spectra of the 

 chemical elements, 63. 



Rose (Prof. H.) on the composition 

 of minerals containing niobium, 

 561. 

 Royal Institution, proceedings of the, 



395. 

 Roval Society, proceedings of the, 72, 

 149, 223, 326, 407, 478, 553. 



Rudorff (Dr.) on the freezing of saline 



solutions, 560. 

 Russell (Dr. W. J.) on the cause of 

 the vesicular structure in copper, 81 . 



(TV. H. L.) on theorems in the 



calculus of symbols, 282. 



Sabine (Major- General) on the secular 

 change in the magnetic dip in Lon- 

 don, 223. 



(R.) on the influence of traces 



of foreign metals on the conducting 

 power of mercury, 457- 



Saline solutions, on the conductibility 

 of, 79 ; on the freezing of, 560. 



Samarskite, on the composition of, 561 . 



Schonbein (Prof.) on the allotropic 

 states of oxygen, and on nitrifica- 

 tion, 466. 



Schrauf (A.) on the optical constants 

 of crystallized substances, 478. 



Schunck (Dr. E.) on sugar in urine, 

 179. 



Seguin ( J.-M.) on the spectra of phos- 

 phorus and sulphur, 416. 



Serres (M. de) on the bone-caves of 

 Lunel-Viel, 239. 



Silicon, on the specific heat of, 116. 



Simpson (M.) on the synthesis of suc- 

 cinic and pyrotartaric acids, 326.. 



Smith (A.) on the deviation of the 

 compass, 149. 



Snow-granules, on the regelation of, 

 312. 



Solar radiation, observations on, 497. 



Spectrum, on the solar, 63. 



Steel, on the relation of the lateral to 

 the longitudinal expansion in rods 

 of, 28. 



Stewart (B.) on internal radiation in 

 uniaxal crystals, 328; on the oc- 

 currence of flint-implements in the 

 drift, 394. 



Stoney (G. J.) on the correction for 

 the length of the needle in tangent- 

 galvanometers, 345. 



Strachey (Lieut. -Col. R.) on the dis- 

 tribution of aqueous vapour in the 

 atmosphere, 152. 



Succinic acid, on the synthesis of, 326. 



Sulphide of sodium, on the action of 

 the nitrate of sodium on, 248. 



Sulphocyanic acid, observations on, 

 473. 



Sulphur, on the spectrum of, 416. 



Sun's heat, on the possible age of the, 

 158. 



