CONTENTS OF VOL. VII.—SIXTH SERIES. vu 
NUMBER XLIL—JUNE. 
Page 
Lord Kelvin on Deep-water Two-dimensional Waves produced 
by any given Initiating Disturbance .................. 609 
Prof. J. Larmor on the ascertained Absence of Effects of 
Motion through the Ather, in relation to the Constitution 
of Matter, and on the FitzGerald-Lorentz Hypothesis .. 621 
Dr. E. P. Harrison on the Temperature-Variation of the 
Coefficient of Expansion of Pure Nickel................ 626 
Prof. J. A. Pollock: A Comparison of the Periods of the 
Electrical Vibrations associated with Simple Circuits. With 
a, Anpendm by J.C. Clase’... 2.25 8s hieweleae. oes sy. 635 
Mr. O. U. Vonwiller: Contribution to the Study of the 
Dielectric Constant of Water at Low Temperatures...... 655 
Mr. E. W. Morley on the Vapour-Pressure of Mercury at 
Seeitaty VeMPeCranres: os. iw. ole oe ojeepiwid be eee at 662 
Prof. M. Smoluchowski-Smolan on the Principles of Aero- 
dynamics and their Application, by the Method of Dynamical 
Similarity, to some special Problems .............0.055 667 
Mr. C. T. R. Wilson on the Condensation Method of Demon- 
strating the Ionisation of Air under Normal Conditions .. 681 
Dr. G. Johnstone Stoney on Escape of Gases from Atmo- 
ALES SSE Se ae rane or eae 690 
Mr. W. Bennett on Non-homocentric Pencils, and the 
Shadows produced by them.—I. An Elementary Treat- 
ment of the Standard Astigmatic Pencil..............., 700 
Mr. W. Bennett on Non-homocentric Pencils, and the 
Shadows produced by them.—II. Shadows produced by 
Axially Symmetrical Pencils possessing Spherical Aberra- 
Bee OE ALG Nay A in ky os aisle Ne eee 706 
I a OS te yn tel a ne A Pt 0 lear a 716 

