T N D E X. 



567 



Poggendorff (Prof.) on the extra 

 current of the induction-current, 1. 



Polarizing prism, on a new, 247- 



Potter (Prof.) on the law of the ex- 

 pansion of gases by increase of 

 temperature, 271. 



Probability of testimony and argu- 

 ments, on the, 12. 



Quartz, on the dispersion of light bv, 

 137; from Euba, on the, 190. 



Radiation, on luminous and obscure, 

 329. 



Ramsay (Prof. A. C.) on the erosion 

 of valleys and lakes, 293. 



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

 perties of certain stream-lines, 282 ; 

 on energetics, 404. 



Raoult (F. M.) on the thermal phe- 

 nomena of voltameters, 551 . 



Ray-transmutation, note on, 554. 



Robinson (Dr. T. R.) on a new mer- 

 curial gasometer and air-pump, 

 235. 



Rodwell (G. F.) on the trompe, 209. 



Rose (Prof. G.) on the colouring 

 matter of emeralds, 167. 



Roval Societv, proceedings of the, 63, 

 152, 235, 314, 391, 477. 



Saturation, on a defect in the theory 

 of, 364. 



Scientific history, notes on, 25. 



Sea-water, on the temperature of, 

 405. 



Secchi (Father) on earth currents and 

 their relation to electrical and mag- 

 netic phenomena, 140 ; on shoot- 

 ing-stars, 377; on the ancient 

 aqueduct of Alatri, 406 ; on the 

 spectrum of Jupiter, 486. 



Shooting-stars, observations on, 377. 



Silicic acid, on the properties of, 

 314. 



Sorby (H. C.) on the microscopical 

 structure of meteorites, 157. 



Soret (J. L.) on the verification of 

 the law of electrolysis when exter- 

 nal work is performed by the gal- 

 vanic current, 563. 



Spectra of ignited gases and vapours, 

 on the, 64; of some of the fixed 

 stars, on the, 152; of compounds 

 and of simple substances, on the, 

 169; on phenomena observed in* 

 the, produced by the light of in- 

 duction-currents in rarefied gases, 

 408. 



Spectrum analysis, observations on, 

 69. 



Stars, on the spectra of some of the 

 fixed, 152. 



Steam-boilers, on the explosion of, 

 78, 324. 



Stefan (Prof.) on the dispersion of 

 light by quartz, 137. 



Stewart (B.) on sun spots, 68. 



Stokes (Prof. G. G.) on the supposed 

 identity of biliverdine with chloro- 

 phyll, 63 ; on the reduction and 

 oxidation of the colouring matter 

 of the blood, 391. 



Stream-lines, on the properties of cer- 

 tain, 282. 



Sulphuric acid, on the purification of, 

 228. 



Sun, observations on the spots of the, 

 68; on the measurement of the 

 chemical brightness of various por- 

 tions of the disk of the, 166. 



Tait (P. G.) on the history of thermo- 

 dynamics, 288. 



Tasmanite, description and analvsis 

 of, 465. 



Tchebychef (P.) on a modification of 

 Watt's parallelogram, 51. 



Telescope, on the photographic use of 

 a silvered-glass reflecting, 249. 



Thallium, on the spectral ray of, 

 168. 



Thermo-dynamics, on the history of, 

 288. 



Thorium, on the atomic weight of, 

 228. 



Tides, on aerial, 154. 



Tomlinson (C.) on the cohesion- 

 figures of liquids, 354. 



Trompe, on the, 209. 



Troost (M.) on the permeability of 

 iron to hydrogen, 229. 



Tuning-fork, on the influence of the 

 pitch of the, on the human voice, 

 349. 



Tyndall (Prof.) on scientific history, 

 25; on the absorption and radia- 

 tion of heat bv gaseous and liquid 

 matter, 81, 329, 438, 508 ; on the 

 conformation of the Alps, 255. 



Valleys, on the erosion of, 293. 



Vapours, on the dynamic radiation 

 of, 102. 



Voice, human, on the influence of the 

 pitch of the tuning-fork on the, 

 349. 



