lnl(j 



I N I) E X. 



Tantalum, on tfre specific charge of 

 the iona emitted by hot, 554. 



Telegraphy, on the energy relations 

 of certain detectors used in; 533. 



Thermions, on the positive, emitted 

 by the alkali sulphates, 0S1; on 

 the positive, emitted by tire salts 

 ^ of the alkali metals. 999. 



Thermometer, on a constant pressure, 



Thompson ( Prof. S. P.) on hysteresis 

 loops and Li88flJ0US' figures. -117. 



Thomson (Sir J. J.) on the theory 

 of radiation. 238 : on the motion 

 of an electrified particle near an 

 electrical doublet, 644: on rays oi' 

 positive electricity, F62. 



Thorium, on the am.. nut of, in sedi- 

 mentary rocks 126, 353 ; on the 

 number of a particles emitted by, 

 691. 



Thornton (Prof. W. M.) on the eye 

 an elecl rical organ, 560. 



Transition layer, on the nature of the, 

 1) itween tw o adjacenl phases,5 2. 



Tiigonometry, on pendulum motion 

 and spherical, 728. 



Trowbridge < Prof. A.) on a vacuum 



'trometer, ~<'> v ; on the »■ \ e- 



tbrm and energy distribution of 

 diffraction gratings, 886; on infra- 

 red investigations with the oche- 

 lette grating, 898. 



Tungsten, on the specific char-.' of 

 the ions emitted by hot, 555. 



Tunzelmann (G. W. de) on the me- 

 chanical pressure of radiation, 533. 



Tvndall (A. ML.) on the ionizing 

 processes at k point discharging in 

 air, 277. 



Tyrer (D.) on relations between the 

 physical properties of liquids at 

 the boiling-point, 532. 



Uranium, on the relation between, 

 and radium, 340 ; on the ratio be- 

 tween, and radium in minerals, 

 345 : on the number of a particles 

 emitted by, 691. 



Uranium X, on the rays and product 

 of, 342. 



Vaughan (A.) on the carboniferous 

 succession in Gower, 791. 



Vibration curves of violin bridge and 

 strings, on the, 4o6. 



, on the mechanical, of atoms, 



057. 



Vibrations, on the finite, >f a system 

 about a configuration of equili- 

 brium, 4o0. 



Violin bridge and strings, on the 

 vibration curves of, 456. 



Viscous liquids, on the stability of 

 superposed streams of, 493. 



Waves, on the transmission of aerial 

 and electrical, by a grating, 303 ; 

 on earthquake, 664; on the scat- 

 tering of, by a cone, (190; on the 

 clinoing of sound-, to concave 

 surfaces, 1001. 



Weir, on a formula for the discharge 

 over a broad-crested, 95. 



Weston cell as a standard of electro- 

 motive force, on the, 206. 



Whispering syallerv, on the problem 

 of the, J 001. 



Whitehead (Prof. J. B.) on the 

 electrostatic effect of a changing 

 magnetic held, 384". 



Whitwell (A.) on the lengths of the 

 focal lines of Cylindrical lenses, 

 59. 



Wilson (Prof. II. A.) on the statis- 

 tical theory of heat radiation, }2l, 

 904 : mi the electron theory of the 



optical properties of metals, 



<:>.). 



Wilson (\Y.) on the reflexion of 

 homogeneous /3-particles of differ- 

 ent velocities, 866 ; on the hetero- 

 geneity of the H rays from a thick 

 layer of radium E, 870. 



Wiltshireite, on the new mineral, 

 474. 



Wireless telegraphy, on the energy 

 relations of certain detectors used 

 in, 533. 



Wires, on the lagging of 511 



Wood (Prof. R. W.) on a new 

 radiant emission from the spa'k, 

 707 ; experiments on refraction by 

 non-homogenenus media, 712 ; on 

 the echelette grating for the infra- 

 red, 770 ; on the groove-form and 

 energy distribution of diffraction 

 gratings, 886; on infra-red in- 

 vestigations with the echelette 

 grating, 898. 



X-rays, on typical cases of ioniza- 

 tion by, 370; on the corpuscular 

 hypothesis of, 385. 



Young (P. B.) on the critical phe- 

 nomena of ether, 793. 



EXI) OF THE TWENTIETH VOLUME. 



Printed by Taylor and Fkancis, Eed Lion Court. Fleet Street. 



