764 INDEX. 
Strutt (Hon. R. J.) on the conduction 
of electricity through high vacua 
under the influence of radioactive 
substances, 157; on the radio- 
activity of various materials, 618. 
Sutherland (W.) on the electric 
origin of gravitation and terrestrial 
magnetism, 685. 
Tanakadate (‘T.) on the theory of the 
rainbow due to a circular source 
of light, 598. 
Telephone cable, on the propagation 
of a periodic current in a, 221. 
Terrestrial temperatures, on a pos- 
sible variation of the solar radia- 
tion and its effect on, 78. 
Thomson (Prof. J. J.) on momentum 
in the electric field, 331. 
Thorium, on the decay of the excited 
radioactivity from, 373. 
Thorium emanation, on the rate of 
decay of, 107. 
Thornton (Dr. W. M.) on the mag- 
netization of iron in bulk, 620. 
Tin, on the magnetic susceptibility 
of alloys of bismuth and, 49. 
Torsion of lead wire beyond the 
elastic limit, on the, 538. 
Townsend (Prof. J. 8.) on the gene- 
sis of ions by the motion of positive 
ions, 738; on the potential re- 
quired to maintain a current in a 
‘gas, 750. 
Tih (Prof. I.) on a theory of 
solutions, 158; on osmosis, solu- 
bility, and narcosis, 704, 
Trouton (Prof.) on the stretching 
and torsion of lead wire beyond 
the elastic limit, 538. 
Trowbridge (Prof. J.) on radium ‘and 
the electron theory, 410. 
Universe, on normal piling and the 
theory of the, 50. 
Vacuum, on electric insulation in, 
534. 
Vibrations, on the electrical, asso- 
ciated with thin terminated con- 
ducting rods, 105, 276; of strings 
excited by plucking and by reso- 
nance, 573; on the lateral, of bars, 
581, 
Vinycomb (T. B.) on the vibrations 
of strings excited by plucking and 
by resonance, 573. 
Walker (G. W.) on the rate of re- 
combination of ions in gases, 206 ; 
on saturation currents in ioniza- 
tion, 650. 
Watts (Dr. W. M.) on the atau 
weight of radium, and on relation- 
ships between the atomic weights 
of the elements and their spectra, 
279. 
Wave-length, on new standards of 
optical, 568. 
Waves, on the momentum in elec- 
trical, 355; on the propagation of 
electric, along spiral wires, and on 
an appliance for measuring the 
length of, used in wireless tele- 
eraphy, 417; on the front and rear 
of a free procession of, in deep 
water, 454. 
Willows (Dr. R. 8.) on chemical 
dissociation and electrical conduc- 
tivity, 4373 
Wireless teleSraphy, on an appliance 
for measuring the length of waves 
used in, 417. 
Wood (Prof. R.. W.) on a quantita- 
tive determination of the anoma- 
lous dispersion of sodium vapour 
in the visible and ultra-violet re- 
gions, 293; on the achromatization 
of approximately monochromatic 
interterence-fringes by a highly 
dispersive medium, 324. 
Zahm (Dr. A, F.) on the atmospheric 
friction on even surfaces, 58. 
END OF THE EIGHTH VOLUME. 
Printed by Taytor and Francis, Red Lion Court, Fleet Street. 
