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INDEX to VOL. XXIII, 



Aberration, on changes in 



diffraction spectra produced by, 

 mid on the, of an echelon grating, 

 25. 



Absorption, on selective, by reson- 

 ating- gas molecules, t>89. 



problems in radioactivity, on, 



242. 



spectra and the solvate theory 



of solution, on, 730. 



Accumulator plates, on the uni- 

 lateral conductivity of sulphated, 

 742. 



./Ether disturbance, on the propaga- 

 tion of periodic, 809. 



Air, on the charges on thermions 

 produced in, 173; on the absorp- 

 tion of Rontgen rays in, 683; on 

 the production of condensation 

 nuclei in, by intense cooling and 

 by ultraviolet light, 849. 



Alkaline earths, on the positive 

 thermions from the salts of the, 

 121. 



Alpha particles from uranium, on 

 the ranges of the, 439 ; from 

 polonium, on the number of ions 

 produced by, 670 ; on the relation 

 between the ranges of, and periods 

 of transformation of radioactive 

 bodies, 981. 



rays, on ionization by, 462 ; on 



the secondary rays excited by the, 

 from polonium, 813 ; theory of 

 the absorption and scattering of 

 the, 901. 



Anderson (Prof. A.) on the quadrant 

 electrometer, 380 ; on electric 

 currents in air at atmospheric 

 pressure, 7£0. 



Andrade (Dr. E. N. da C.) on the 

 nature and velocity of migration 

 of the carriers of electricity in 

 flames containing metallic vapours, 

 865. 



Angle, on the trisection of a, 640, 

 860, 861. 



Angular displacements, on an in- 

 strument for measuring small, 

 385. 



Ashworth (Dr. J. R.) on the mag- 

 netic Temperature coefficients of 

 the ferro - magnetic elements, 

 36. 



Asteroids, on the, 337. 



Atmosphere, on the effects of the 

 diurnal rotation on the upper, 

 6(54 ; on the electrification of the, 

 852. 



Aurora borealis, on the properties of 

 the rays producing, 211. 



Barium, on the positive thermions 

 from salts of. 127. 



Barkla (Prof. C. G.) on ionization in 

 gaseous mixtures by Rontgen ra- 

 diation, 317 ; on the absorption 

 of X-rays and fluorercent X-ray 

 spectra, 987. 



Barton (Prof. E. H.) on simultaneous 

 vibration curves for strings and 

 air of violin, 885. 



Barus (Prof. C.) on the rectification 

 of the spectrum in relation to the 

 shifts of ellipses in displacement 

 interferon] etry, 942. 



Blakesley (T. H.) on a kinematic 

 method of finding the roots of 

 equations, 892. 



Bohr (Dr. N.) on the electron theory 

 of thermoelectric phenomena, 

 984. 



Books, new : — Durell's Course of 

 Plane Geometry for Advanced 

 Students, 445 ; Milne's Homo- 

 geneous Coordinates for use in 

 Colleges and Schools, 446 ; Flem- 

 ing's The Propagation of Electric 

 Currents in Telephone and Tele- 

 graph Conductors, 446 ; Bulletin 

 of the Bureau of Standards, 447 ; 



