INDEX. 



463 



currents and the theory of the in- 

 duction-balance, 123, 232. 



Long (Dr. J. H.) on the diffusion of 

 liquids, 313, 413. 



Luminous tubes, on some new, 155. 



Magnet, on a new action of the, on 

 electric currents, 225, 432. 



Magnetism, on new methods for the 

 determination of the absolute ho- 

 rizontal intensity of the earth's, 

 443. 



Magnetometer, on a complete theory 

 of the bifilar, 443. 



Magnets, on, 153 ; on the carrying- 

 power of, 232 ; on the induction- 

 coefficients of, 445. 



Mallet (R ) on the temperature of 

 the primordial ocean of our globe, 

 72. 



Mascart (M.) on the theory of induc- 

 tion-currents, 452. 



Maxwell's theory of light, on, 284. 



Microphone, theory of the, 451- 



Molecules, on the mean free path of 

 the, 177. 



Montigny (Oh.) on supernumerary 

 rainbows, 389. 



Morisot (M.) on the specific heat and 

 conductivity of bodies, 386. 



Musical note, on the production of a, 

 in a continuous tube, 439. 



Nagyagite, on some crystalline forms 

 ^ of, 188. 



Napier's rods, on a calculating appa- 

 ratus, based on, 19L 



Newton's Regula tertia philoso- 

 phandi, observations on, 21. 



Nebulae, on the constitution of, 309. 



Nipher (P. E.) on the electric light, 

 120. 



Nitrogen, on the relative intensity of 

 the spectral lines of, in regard to 

 the constitution of nebulas, 309. 



Ocean, primordial, of our globe, on 

 the probable temperature of the, 

 72. 



Optics, investigation in, 40. 



Perry (Prof. J.) on a dispersion-pho- 

 tometer, 117 ; on the determina- 

 tion of the acceleration of gravity 

 for Tokio, 292. 



Physical forces, on the hydrodyna- 

 mical theory of the, 448. 



Pihl (0. A. S.) on magnets, 153. 



Poynting (J. H.) on the graduation 

 of the sonometer, 59. 



Preston (S. Tolver) on crystalliza- 



tion, 267; on method in causal 

 research, 356. 

 Primary forms, on, 348. 

 Prisms, on the aberration of, 40. 

 Rainbows, on supernumerary, 389. 

 Rayleigh (Lord), investigations in 

 optics by, with special reference to 

 the spectroscope, 40; acoustical 

 observations by, 278. 

 Realgar, on some crystalline forms 



of, 189. 

 Rennie (E. H.) on the determination 

 of chemical affinity in terms of 

 electromotive force, 331. 

 Resistance-balance, on a new form 



of, 109. 

 Ridout (R. H.) on some effects of 

 vibratory motion in fluids j on the 

 flow of liquids from an expanded 

 orifice ; and laboratory notes, 435. 

 Rood (Prof. 0. N.) on a method of 

 studying the reflexion of sound- 

 waves, 234. 

 Rosetti (Fr.) on the thermal absor- 

 bent and emissive powers of flames, 

 and on the temperature of the vol- 

 taic arc, 154. 

 Rowland (Prof. H. A.) on a new 

 action of magnetism on electric 

 currents, 432. 

 Rucker (Prof. A. W.) on the consti- 

 tution of chlorine, 35. 

 Sarrau (M.) on the decomposition of 

 some explosives in a closed vessel, 

 455. 

 Silver, on some crystalline forms of, 

 184. 



films, on the use of, in improved 



instruments of the camera-lucida 

 class, 409. 

 Siren, on a new form of, 280. 

 Solids, on certain vibrations of, 15. 

 Sonometer, on the graduation of the, 



59, 144. 

 Sound, on the measure of the inten- 

 sity of, 174 ; on the rate of propa- 

 gation of, 83. 

 Sounds, on intermittent, 278. 

 Sound-waves, on a method of study- 

 ing the reflexion of, 234. 

 Spectroscope, investigations in optics 



with special reference to the, 40. 

 Spheroidal state, on the laws which 



govern matter in the, 457. 

 Stefan (Prof. J.) on the carrying- 

 power of magnets, 232. 

 Strings, on the forms of the vibra- 



