[ 773 ] 



INDEX to VOL XXI 



ACTINIUM, on the y-raya of, 

 130. 



Age-distribution, on a problem in, 

 435. 



Air, on the electrification of the, 

 near the Zambesi Falls, 611. 



Airey (J. R.) on the oscillations of 

 chains, 736. 



Aldis (A. C. W.) on a revolving- 

 table method of determining- the 

 curvature of spherical surfaces, 

 218. 



Alkali salt vapours, on the velocity 

 of the ions of, in flames, 711. 



Allen (Prof. F.) on a method of 

 measuring the luminosity of the 

 spectrum, 604. 



Alpha particles, on the ionization of 

 different gases by the, from polo- 

 nium, 571 ; on the scattering of, 

 by matter, 669. 



Anderson (Prof. A.) on the com- 

 parison of two self-inductions, 608. 



Asymmetric oscillations, on water 

 waves as, 773. 



system, on a property of the, 



161. 



Atmosphere, on the ionization of 

 the, due to radioactive matter, 26. 



Atomic weight, on the relation be- 

 tween viscosity and, for the inert 

 gases, 45. 



Atoms, on the law of chemical 

 attraction between, 83 ; on the 

 structure of, 669 ; on the number 

 of electrons in, 718. 



Ayres (T.) on the distribution of 

 secondary X rays and the electro- 

 magnetic pulse theory, 270. 



Baeyer (Prof. 0. von) on extremely 

 long waves emitted by the quartz 

 mercury lamp, 689. 



Bailey (E. B.) on recumbent folds 

 in the Highland schists, 174. 



Barkla (Prof. C. G.) on the distri- 



bution of secondary X rays and 

 the electromagnetic pulse theory, 

 270 ; on the energy of scattered 

 X-radiation, 618. 



Bams (Prof.' C.) on interferometry 

 with the aid of a grating, 411. 



Bateman (H.), some problems in the 

 theory of probability, 745. 



Bessel's functions as applied to the 

 vibrations of a circular membrane, 

 on, 53 ; on a physical interpreta- 

 tion of Schlomilch's theorem in, 

 567. 



Beta particles, on the scattering of, 

 by matter, 669. 



Birds, on metallic colouring in, 554. 



Books, new : — Berkeley's Mysticism 

 in Modern Mathematics, 278 ; 

 Curie's Traits' de Radioactivite, 

 390 ; Barbillion and Ferroux's 

 Les Compteurs electriques a Cour- 

 ants continus et a Courants alter- 

 natifs, 301 ; Turpain's Notions 

 fondamentales sur la Telegraphie, 

 391 ; Turpain's Telephonie, 391 ; 

 Mann and Twiss's Physics, 583 ; 

 Tutton's Crystalline Structure and 

 Chemical Constitution, 584. 



Bosworth (T. O.) on the JKeuper 

 marls around Charnwood Forest, 

 695. 



Boyle (Dr. R. W.) on the behaviour 

 of radium emanation at low tempe- 

 ratures, 722. 



Bromine vapour, on the destruction 

 of the fluorescence of, by other 

 gases, 309. 



Bury (H.) on the denudation of the 

 western end of the Weald, 176. 



Campbell (N.) on a method of de- 

 termining capacities in measure- 

 ments of ionization, 42 ; on the 

 common sense of relativity, 502 ; 

 on relativity and the conservation 

 of momentum, 626. 



