INDEX. 



443 



Magnetization of iron and steel, on 

 effects of retentiveness in the, 246. 



Magnetomotive force, on, 205., 



Mascart (Prof.) on the electrification 

 of the air, 70. 



Metals, on the " rotational coeffi- 

 cients " of various, 341. 



Metre- and inch-scales, on an arrange- 

 ment for dividing, 217. 



Mica-films for polarizing purposes, 

 437. 



Michelson (A. A.) on a method for 

 determining the rate of tuning- 

 forks, 84. 



Millimetre-screw, on a simple method 

 of cutting a, 438. 



Moon (W.) on a method of calcula- 

 ting the amounts of magnetism of 

 a magnetic circle, 389. 



Nicol (W. W. J.) on the nature of 

 solution, 91 ; on a new form of 

 constant-temperature bath, 339. 



Oats (F.) on the diamond-fields of 

 South Africa, 220. 



Ohm, on the determination of the, 

 149. 



Oil, on a theoretic interpretation of 

 the calming effect of, on the surges 

 of the sea, 68. 



Optical combinations of crystalline 

 films, on, 301. 



Pauchon (E.) on the upper limit of 

 the perceptibility of sounds, 371. 



Pendulums, on the control of, 78. 



Perry (Prof. J.) on the resistance of 

 the electric arc, 346 ; on winding 

 electromagnets, 397. 



Photometer, on a new, 423 ; on a 

 wedge-and-diaphragm, 22. 



Polarizing prisms, on, 352, 435, 437. 



Pringsheim (E.) on the radiometer, 

 101 ; on a measurement of wave- 

 lengths in the ultra-red region of 

 the spectrum of the sun, 235. 



Pycnometer, on a modification in the, 

 369. 



Quartz, on the change in the double 

 refraction of, produced by electric 

 forces, 132. 



Radiometer, on the, 101. 



Rayleigh (Lord) on maintained vi- 

 brations, 229 ; on the vibrations of 

 a cylindrical vessel containing 

 liquid, 385. 



Reade (T. M.) on the drift-beds of 

 the north-east of England and 

 North Wales, 60. 



Refraction-indices of gases at high 

 pressures, on the, 299. 



Righi (A.) on the displacements and 

 deformations of electric sparks by 

 electrostatic actions, 72. 



Riley (J. T.) on capillary pheno- 

 mena, 191. 



Riviere (O.) on the refraction-indices 

 of gases at high pressures, 299. 



Rontgen (Prof. W. C.) on the change 

 in the double refraction of quartz 

 produced by electric forces, 132. 



Sabine (R.) on a wedge-and-dia- 

 phragm photometer, 22. 



Saponine, on the viscosity of a solu- 

 tion of, 406. 



Seismographic apparatus, on, 363. 



Selenium cells, on the electrical re- 

 sistance of, 31. 



Sensations, on the errors of our, 

 259. 



Smith (F. J.) on a new form of ergo - 

 meter, 87; on a high-pressure 

 accumulator, 203 ; on a new form 

 of horse-power indicator, 434. 



Solar action, on the regenerative 

 theory of, 400. 



energy, on the selective absorp- 

 tion of, 153. 



spectrum, phosphorography of 



the infra-red region of the, 223 ; 

 on the ultra-red region of the, 

 235. 



Solution, on the nature of, 91. 



Sounds, on the upper limit of the 

 perceptibility of, 371. 



Sound- vibrations, on the direct pho- 

 tography of, 151. 



Spectra formed by curved diffraction- 

 gratings, on the, 183. 



Speed-indicator, on a, 90. 



Stables (W. H.) on the viscosity of 

 a solution of saponine, 406. 



Statics, on the basis of, 187. 



Steel, on effects of retentiveness in 

 the magnetization of, 246. 



Sun, on the measurement of wave- 

 lengths in the ultra-red region of 

 the specirum of the, 235. 



Sun-spots, on the absorption-spectra 

 of, 29. 



Sylvester (Prof. J. J.) on the num- 

 ber of fractions contained in any 

 " Farey series," 251. 



Thermometers, on the exactness of 

 the measurements made with mer- 



