CONTENTS. 
(A) 
VOL. 183. 
I. On the Physics of Media that are Composed of Free and Perfectly Elastic 
Molecules in a State of Motion. By J. J. Waterston. Communicated by 
Captain Beaufort, R.N., F.P.S., &c . page 1 
II. On the Time relations of the Excursions of the Capillary Electrometer, with a 
Description of the Method of Using it for the Investigation of Electrical 
Changes of Short Duration. By George J. Burch, B.A., Oxon. Communi¬ 
cated by Professor Bartholomew Price, F.R.S . 81 
III. On some of the Properties of Water and of Steam. By William Ramsay, 
Ph.D., F.R.S., and Sydney Young, D.Sc . 107 
IV. Comparison of Simultaneous Magnetic Disturbances at Several Observatories. 
By Professor W. Grylls Adams, D.Sc., F.R.S . 131 
V. On the Locus of Singular Points and Lines which occur in connection with the 
Theory of the Locus of Ultimate Intersections of a System of Surfaces. By 
M. J. M. Hill, M.A., Sc.D., Professor of Mathematics at University College, 
London. Communicated by Professor Henrici, F.R.S . 141 
VI. Repulsion and Rotation produced by Alternating Electric Currents. By 
G. T. Walker, B.A., B.Sc., Fellow of Trinity College , Cambridge. Com¬ 
municated by Professor J. J. Thomson.279 
VII. Re-determination of the Mass of a Cubic Inch of Distilled Water. By H. J. 
Chaney. Communicated by Sir G. Gabriel Stokes, Bart., F.R.S. . 331 
