INDEX. 



551 



Leucophane, on the law of twinning 

 and hemihedrism of, 357. 



Lewis (W. J.) on the crystaUogra- 

 phical forms of glaucodote, 354; 

 crystallographic notes by, 453. 



Lievrite, on the composition of, 287. 



Light, on the action of, on selenium^ 

 295 ; on the polarized, of the rain- 

 bow, 319 ; on the reflection of po- 

 larized, 397 ; on the influence of, 

 upon the electrical resistance of 

 metals, 481 ; on the rotation of the 

 plane of polarization of, by reflec- 

 tion from the pole of a magnet, 529. 



Lodge (0. J.) on thermo-electric 

 phenomena, 349; on a modifica- 

 tion of Mance's method of mea- 

 suring battery resistance, 515. 



Ludlamite, on the composition of, 52 ; 

 on the crystallographical and op- 

 tical characters of, 54, 135, 525. 



Mace (J.) on accidental double re- 

 fraction, 547. 



Magnet, on rotation of the plane of 

 polarization by reflection from the 

 pole of a, 321, 529. 



Magnetism, on the action of, on a 

 rotating disk, 157. 



Magnetization of steel by "currents, 

 on the, 119,192. 



Magnets, on the portative force of 

 horse-shoe, 75 ; on the determina- 

 tion of the polar distance in, 236. 



Mallet (R.) on the conversion of 

 geyser-throats into volcanic vents, 

 108. 



Maskelyne (Prof.) on the crystallo- 

 graphical and optical characters of 

 Ludlamite, 54, 135, 525. 



Matter, on the gaseous state of, 63. 



Mercury, on the condensation of va- 

 pour of, on selenium, 67. 



Metals, on the spectra of, at the base 

 of flames, 238 ; on the diatherma- 

 neity of, 396; on the influence of 

 light upon the electrical resistance 

 of, 481. 



Mills (Dr. E. J.) on cumulative reso- 

 lution, 492. 



Mineral veins, on the formation of, 

 154. 



Minerals: Ludlamite, 52, 135, 525; 

 Franklandite, 284; lievrite, 287; 

 glaucodote, 354; humite, 357; 

 sphene, 455. 



Molecular volumes, note on, 398. 



Morgan (W.) on the formation of 



mineral veins, 154. 

 Moss (R. J.) on the condensation of 



vapour of mercury on selenium, 



67. 

 Mouton (M.) on the metallic reflec- 

 tion of polarized heat-rays, 477. 

 Muir (M. M. P.) on gallium, 281. 

 (T.) on a theorem in conti- 

 nuants, 137, 360. 

 Nebular theory, on the physical and 



mathematical principles of the, 



203, 262. 

 Niven (Prof. C.) on the theory of an 



imperfectly homogeneous elastic 



solid, 241. 

 Organ-pipes, on the pitch of, 462. 

 Palladium, on the action of the flame 



of alcohol upon the metal, 35. 

 Paper, on the diathermaneity of, 396. 

 Peirce (Prof. C. S.) on the sensation 



of colour, 543. 

 Pendulum-vibration in air, on the 



energy per second of a, 343. 

 Pendulums, on the correction of the 



variations of rate of astronomic, 80. 

 Phillips (J. A.) on the chemical and 



mineralogical changes which have 



taken place in certain eruptive 



rocks, 235. 

 Photographic image, on the alkaline 



development of the, 46. 

 Planets, on a suggested explanation 



of the obliquity of, to their orbits, 



188. 

 Polarization, on the rotation of the 



plane of, by reflection from the 



pole of a magnet, 321. 

 Preston (S. T.) on the mode of the 



propagation of sound, 441. 

 Proteine compounds, on a method of 



determining the amount of, in ve- 

 getable substances, 382. 

 Puluj (Dr. J.) on the diffusion of 



vapours through clay cells, 480. 

 Quincke (G.) on diffusion and the 



question, is glass impervious to 



gases? 314. 



repulsion resulting 

 on the theory of the, 



Radiation, on 

 from, 231. 



Radiometer, 

 278, 395, 467. 



Rainbow, on the polarized light of 

 the, 319. 



Rayleigh (Lord) on a permanent de- 

 flection of the galvanometer-needle 



