INDEX. 
467 
Laboratory appliances, on some im- 
proved, 408. 
Laplace's theory of capillarity, on, 
309, 339. 
Leeds (Dr. A. R.) on a photo-che- 
mical method for the determina- 
tion of organic matter in potable 
water, 9. 
Liquids, on the measurement of the 
electrical resistance of, 132. 
Liveing (Prof. G. D.) on sun-spots 
and terrestrial elements in the sun, 
401. 
Lommel (E.) on the fluorescence of 
iodine vapour, 463. 
Mackey (W. M'D.) on lines of no 
chemical change, 429. 
Magnetic fields, on the determination 
in absolute units of the intensities 
of powerful, 144. 
Magnetism, on the influence of, upon 
thermal conductivity, 397. 
Magnetization of iron and steel, on 
effects of retentiveness in the, 159, 
381. 
Metal wires, on a new method of in- 
sulating, 400. 
Metallic bodies, on the influence of 
the direction of the lines of force 
on the distribution of electricity 
on, 269. 
Meteorites, on the classification of, 
464. 
Mica films and prisms for polarizing 
purposes, on, 109. 
Microphones, on metal, in vacuo, 23. 
Mills (Dr. E. J.) on lines of no che- 
mical change, 429. 
Molecular constants, on certain, 
321. 
radiation in incandescence lamps, 
on a phenomenon of, 48. 
volumes of salt-solutions, on 
the, 121, 
Motion, on the laws of, 439. 
Munro (J. ) on metal microphones in 
vacuo, 23. 
Nicol (W. W. J.) on the molecular 
volumes of salt-solutions, 121. 
Nitrogen, on the liquefaction of, 76. 
Obach (Dr. E.) on a movable-coil 
galvanometer, 77. 
O'Farrell (F. J.) on some improved 
laboratory appliances, 408. 
Olszewski (Prof. K.) on the liquefac- 
tion of oxygen and the congelation 
of carbon disulphide and alcohol, 
75 ; on the liquefaction of nitrogen 
and carbonic oxide, 76. 
Oxygen, on the liquefaction of, 75. 
Penrose (C. B.) on the influence of 
magnetism upon thermal conduc- 
tivity, 397. 
Perry (Prof. J.) on the measurement 
of the electrical resistance of liquids, 
132. 
Piezoelectric properties of quartz, 
on the, 194. 
Planetary theory, on the equation to 
the secular inequalities in the, 267. 
Polarizers, on mica films and prisms 
for, 109. 
Probability, on the physical basis of, 
433. 
Quartz, on the change in the double 
refraction of, produced by electrical 
force, 96 ; on the thermoelectric, 
actinoelectric, and piezoelectric pro- 
perties of, 194. 
Quaternions, on the involution and 
evolution of, 394. 
Quet (M.) on the induction produced 
by variation of the intensity of the 
electric current in a spherical sole- 
noid, 456. 
Quincke (Prof. G.) on the constant 
of dielectricity and the double 
refraction of insulating fluids, 1. 
Radiation, energy, and temperature, 
on the relations between, 224. 
Radiometers, observations on, 240. 
Ramsay (W.) on the critical point of 
liquefiable gases, 118. 
Rayleigh (Lord) on the crispations of 
fluid resting upon a vibrating sup- 
port, 50 ; on porous bodies in rela- 
tion to sound, 181 ; on Laplace's 
theory of capillarity, 309. 
Rays, an illustration of the crossing 
of, 58. 
Refraction, on the double, of insula- 
ting fluids, 1. 
Rontgen (Prof. W. C.) on the change 
in the double refraction of quartz 
produced by electrical force, 96; 
on the thermoelectric, actinoelec- 
tric, and piezoelectric properties 
of quartz, 194. 
Rowland (Prof. H. A.) on concave 
gratings for optical purposes, 197 ; 
on the aberration of concave gra- 
tings, 210. 
Salts, on the relation between the 
internal friction and resistance of 
