INDEX. 
Morgan (Prof. C. Ll.) on the igneous 
rocks of the Bristol district, 
510. 
Morley (EK. W.) on the vapour- 
pressure of mercury at ordinary 
temperatures, 662. 
Nagaoka (Prof. H.) on the kinetics 
of a system of particles illus- 
trating the line and the band 
spectrum and the phenomena of 
radioactivity, 445. 
Nickei, on the temperature-variation 
of the coefficient of expansion of 
pure, 626. 
Optical and electrical qualities of 
metals, on relations between the, 
157. 
Orr (Prof. W. M‘F.) on the radia- 
tion from an alternating circular 
current, 356, 
Oxygen and hydrogen at low pres- 
sures, on the effect of the passage 
of electricity through a mixture 
ae 225. 
Parabolas, on a novel instrument for 
drawing, 200. 
Pearson (Prof. K.) on a novel instru- 
ment for drawing parabolas, 200. 
Pencils, notes on non-homocentric, 
700, 706. 
Pfund (A. H.) on the selenium cell, 
Photographic action of radium rays, 
on the, 288. 
Photometer, onthe Simmance-Abady 
flicker, 341. 
mw, note on, 315. 
Pitch-like substances, on the vis- 
cosity of, 347. 
Platinum metals, on the disintegration 
of the, in different gases, 388. 
Plumb-line, on deflexions of the, in 
India, 14, 292, 
Pollock (Prof. J. A.) on the periods 
of the electrical vibrations asso- 
ciated with simple circuits, 635. 
Porter (T. C.) on a method of 
oy reinforcing sounds, 
Potential, on the variation of, along 
the transmitting antenna in wire- 
less telegraphy, 124. 
Radiation from an alternating circu- 
lar current, on the, 336; on the 
energy of secondary Rontgen, 543 ; 
on the intensity of the natural, 
from moving bodies, 578, 
tio 
Radioactive substances, application 
of, to the comparison of capacities, 
362. 
Radioactivity of the atmosphere, on 
the, 140; on the kinetics of a 
system of particles illustrating the 
phenomena of, 445. 
Radium, on the motion of, in the 
electric field, 305. 
Radium emanation, on the heating 
effect of the, 202; on the nature 
of the, 220; on the rotting ot 
cambric by exposure to, 233; on 
the photographic action of, 288 ; 
on the charge carried by the, 
355. 
Rau (Prof. H. N.) on a deep-sea 
deposit from Kilacheri, 313, 
Reid (C. and E. M.) on a paleo- 
lithic floor at Prah Sands, 312. 
Resonator, on the effect of capacity 
at the ends of a circular, 652. 
Reynolds (Prof. 8. H.) on the igneous 
rocks of the Bristol district, 310; 
on the Rhetic beds of the S. 
Wales direct line, 314. 
Richardson (O. W.) on the solubility 
and diffusion in solution of dis- 
sociated gases, 266. 
Rigidity, on the electric origin of, 
417. 
Roéntgen radiation, on the effect of 
temperature on the ionization pro- 
duced in gases by, 81; on the 
energy of secondary, 543. 
Rubens (Prof. H.) on relations 
between the optical and the 
electrical qualities of metals, 
157. 
Rutherford (Prof. E.) on the heating 
effect of the radium emanation, 
202. 
Schuster (Prof. A.) on a simple ex- 
planation of Talbot’s bands, 1; on 
the number of electrons conveying 
the conduction currents in metals, 
151. 
Selenium cell, on the, 26. 
Shadows produced by axially sym- 
metrical pencils, on, 706. 
Shafts, on the whirling and trans- 
verse vibrations of rotating, 
504. 
Short (A. R.) on the Rheetic beds of 
England, 311. 
Simmance (—.) on the Simmance- 
Abady flicker photometer, 341. 
