﻿1 N D E X. 



1007 



Pudge (Prof. W. A. D.) on the 

 electrification of the atmosphere 

 and surface of the earth, 852. 



St. Gothard tunnel, on the radio- 

 activity of the roeks of the, 201. 



Seheel (K.) on the thermal expansion 

 of mercury, 412. 



Searle (J. H. C.) on the problem of 

 the weir, 772. 



Shorter (S. A.) on the application 

 of the theory of chemical potential 

 to the thermodynamical theory of 

 solutions, 483. 



Silberstein (Dr. L.) on the quater- 

 nionic form of relativity, 790. 



Silica, on the anisotropic expansion 

 of a drawn tube of vitreous, 998. 



Simons (L.) on ionization in gaseous 

 mixtures by Riintgen radiation, 

 317. 



Smoluchowski (Prof. M. S.) on 

 opalescence of gases in the critical 

 state, 165. 



Solutions, on the application of the 

 theory of chemical p )tential to 

 the thermodynamical theory of, 

 483 ; on absorption spectra and 

 the solvate theory of, 730. 



Spectra, on changes in diffraction, 

 produced by aberration, 25 ; on 

 absorption, and the solvate theory 

 of solution, 730. 



Spectral series, on the theory of, 600. 



Spectrum, on the, of the magnesium 

 high-frequency arc, 94 ; on the 

 rectification of the, in relation 

 to the shift of ellipses in inter- 

 ferometry, 942. 



Stansfield (Dr. H.) on changes in 

 diffraction spectra produced by 

 aberration and the aberration of an 

 echelon grating, 25. 



Stephenson (A.) on the propagation 

 of periodic sether disturbance, 809. 



Steven (A. I.) on the composition of 

 two simple harmonic motions 

 exhibited by a stretched string, 

 977. 



Stresses in a bar, on the investigation 

 of, by means of polarized light, 1. 



String, on transverse vibrations of a, 

 maintained by forces of double 

 frequency, 931 ; on the composition 

 of two simple harmonic motions 

 exhibited by a r.tretched, 977. 



Strontium, on the positive thermions 

 from salts of, 132. 



Sukhodski (W.) on the internal 



pressure of a liquid, 955. 

 Swann (Dr. W. F. G.) on a deduction 



of the effects of uniform trans- 



latory motion from the electrical 



theory of matter, 64 : on the 



FitzGerald Lorentz contraction 



and the method of determining 



the motions of electrons, 86. 

 Taylor (Dr. T. S.) on the number of 



ions produced by an a particle 



from polonium, 670. 

 Thermions, on the positive, from the 



salts of the alkaline earths, 121 ; 



on the role played by gases in the 



emission of positive, from salts, 



139 ; on the charges on, produced 



in air and hydrogen at atmospheric 



pressure, 173. 

 Thermodynamical relations, on the 



deduction of, 752. 

 Thermoelectric phenomena, on the 



electron theory of, 984. 

 Thermoelectricity, on the electron 



theory of contact electromotive 



force and, 263. 

 Thompson (Prof. S. P.) on harmonic 



analysis, 334. 

 Thomson (Sir J. J.) on ionization by 



moving electrified particles, 449. 

 Time-scale, on the, 651. 

 Tolman (Prof. R. C.) on non- 

 Newtonian mechanics, 375. 

 Townsend (Prof. J. S.) on the 



charges on ions. 677 ; on ionization 



by collision, 856. 

 Transpiration of gases through tubes, 



on a method of investigating the, 



250. 

 Tyrer (D.) on the law of molecular 



attraction, 101. 

 Ultraviolet light, on the action of, 



on chlorine, 757; on the production 



of condensation nuclei by, 849. 

 Unipolar induction, on, 937. 

 Uranium, on the ranges of the a 



particles from, 439. 

 Vapour-pressure, on the effect of 



pressure on, 485. 

 Vegard (L.) on the properties of the 



ravs producing aurora borealis, 



211. 

 Vibrations, on transverse, of a string 



maintained by forces of double 



frequency, 931. 

 Violin, on simultaneous vibration 



curves for strings and air of. 885. 



