772 
INDEX. 
Reid (C.) on the pillow-lava near 
Port Isaac, 576. 
Relativity, on the principle of, 316. 
Resonance spectra of sodium vapour, 
on the, 581. 
Richardson (L. F.) on a freehand 
graphic way of determining stream- 
lines and equi potentials, 237. 
Richardson (Prof. 0. W.) on the 
displacement of spectral lines by 
pressure, 204. 
Rontgen rays, on the heating effects 
produced by, 432. 
Rose-Innes (J.) on the thermo- 
dynamic scale of temperature, 301. 
Rupture of materials under combined 
stress, on the, 81. 
Russ (S.) on the distribution in 
electric fields of the active deposits 
of radium, thorium, and actinium, 
601 ; on the charge of the 
active deposit of actinium, 737. 
Saturn, on the tores of, 468. 
Schott (G. A.) on the electron theory 
of matter and the explanation of 
magnetic properties, 172 ; on the 
frequencies of the free vibrations 
of quasi-permanent systems of 
electrons, 438. 
Sea-water, radioactivity of, 385. 
Smith (S. W. J.) on the contact 
potential-differences determined by 
means of null solutions, 478. 
Sodium atom, on the existence of 
positive electrons in the, 274. 
vapour, on the resonance 
spectra of, 581. 
Sorby (Dr. H. C.) on the structure 
and history of rocks, 574. 
Sound, on waves of, in conical pipes, 
69 ; on the factors serving to de- 
termine the direction of, 318. 
Spectra of sodium vapour, on the 
resonance, 581. 
Spectrophotometer, on a new, 282. 
Spectroscope, on the effect of the 
position of the grating on the 
resolving power of a, 762. 
Spectrum lines, on the explanation 
of, 438. 
■Stability, on induced, 233. 
Steel, on the effect of combined 
stresses on the elastic properties 
of, 214. 
Stephenson (A.) on induced sta- 
bility, 233 ; on mechanical phos- 
phorescence, 352. 
Stream-lines, on -a freehand graphic 
way of determining, 237. 
Struts, on laterally loaded, 711. 
Surface-concentration, on Gribbs's 
theory of, 499. 
forces, on the theory of, 413. 
Temperature, on the thermodynamic 
scale of, 301. 
Temperature equilibrium, on certain 
dynamical analogues of, 765. 
Terada (T.) on the secondary undu- 
lations of oceanic tides, 88. 
Thermodynamic corrections of the 
nitrogen scale, on the, 526. 
scale of temperature, on the 
practical attainment of the, 301. 
Thorium, distribution in electric 
fields of the active deposit of, 601. 
Tides, on the secondary undulations 
of oceanic, 88. 
Tie-rods, on laterally loaded, 711. 
Tomkins (J. A.) on the focometry 
of a concave lens, 198, 300. 
Vibrations, on, in conical pipes, 69 ; 
on the thermally excited, of an 
atmosphere, 147. 
Wave-lengths, measurements of, 548. 
Wilde (Dr. H.) on the atomic 
weight of radium, 280. 
Williams (W. E.), rupture of ma- 
terials under combined stress, 81. 
Wood (Prof. R. W.) on the anom- 
alous magnetic rotatory dispersion 
of neodymium, 270 ; on the ex- 
istence of positive electrons in the 
sodium atom, 274 ; on the reson- 
ance spectra of sodium, 581. 
Wright ( Prof. G. F.) on the glacial 
epoch in X. America, 573. 
Wright (W. B.) on the two earth- 
movements of Colonsay, 579. 
X-ravs and scattered X-rays, on, 
288. m 
Zinc, on the heating effects produced 
by Rontgen rays in, 432. 
END OF THE FIFTHTEEXTH VOLUME. 
Printed by Taylor and Francis, Red Lion Court. Fleet Street. 
J(^/\ATXrJ^oJr 
