vl CONTENTS OF VOL. XIX.—FIFTH SERIES. 
e 
Dr. J. A. Fleming on the Characteristic Curves and Surfaces ; 
of Imcandescence Lamps \.)sc% . 0.20) 0G ee 368 
Prof. W. C. Rontgen’s Experiments on the. Electromagnetic 
Action of Dielectric Polarization... .. ....0./.0 5.25.0 385 
Notices respecting. New Books :— 
Mr. Charles Pendlebury’s Lenses and Systems of Lenses, 
treated after the manner of Gauss ................ 388 
Mr, Latimer Clark’s Transit Tables for 1885 .......... 389 
Dr. R. Wormell’s Electrical Units, their Relation to one 
another, and other Physical Units ................ 389 
Proceedings of the Geological Society :— . 
Mr. Frank Rutley on Fulgurite from Mont Blane...... 389 
Mr. Frank Rutley on Brecciated Porfido-rosso-antico .. 390 
Dr. C. Callaway on the Granitic and Schistose Rocks of 
_ Donegal and some other parts of Ireland .......... 390 
Mr. G, A. J. Cole on Hollow Spherulites and their oc- 
currence in ancient British Lavas ........./...... 391 
Rev. A. Irving ona General Section of the Bagshot Strata 
from Aldershot to. Wokingham .~..).'..22 02/00. ae 392 
Experimental Researches upon the Determination of the Di- 
electric Constant of some Gases, by Dr. Ignaz Klemencic.. 393 
Formation of a Stalactite by Vapour, by J. Brown ........ 395 
Measurement of Strong Electrical Currents, by John Trowbridge 396 
NUMBER CXXI.—JUNE. 
Mr. O. Heaviside on the Electromagnetic Wave-surface .... 397 
Mr. EK. H. Hall on the Rotation of the Equipotential Lines of 
an Electric Current by Magnetic Action................ 419 
Prof. G. F. Fitzgerald on the Structure of Mechanicai Models 
illustrating some Properties of the Aither .............. 438 
Lord Rayleigh on the Theory of Illumination in a Fog...... 443 
Lord Rayleigh on a Monochromatic Telescope, with Applica- 
tion, to Photometry. 5 lai). dah. Feo vat. El 2 eee 446 
Prof. O. J. Lodge on a slight Error in the customaty Specifica- 
tion of Thermoelectric Current-direction, and a Query with 
regard to a point in Thermodynamics. (Plate III.)...... 448 
Dr. W. W. J. Nicol on Supersaturation of Salt-Solutions.... 453 
Colonel Malcolm on Binocular Glasses adjustable to Hyes 
havine, unequal Mocalslensths Us) GO e728 ee eee 461 
Prof. A. W. Riicker on the Self-Regulation of the Compound 
1) FOC hi Omar a penn Mr aE RA eh A ne Pee es ohh anc. § s 462 
Prof. O. Lodge on the Identity of Energy, in connection with 
Mr. Poynting’s Paper on the Transfer of Energy in an 
Hlectromagnetic Field; and on the two Fundamental Forms 
OL Mnersyo Cee Cea ee ea aa ee 8 eee nal ee enone nernege A482 
