CONTENTS. 
(A) 
VOL. 184. 
I. Transraission of Sunlight through the Earth's Atmosphere. By Captain W. de W. 
Abney, C.B., D.C.L., F.R.S. .page 1 
II. The Potential of an Anchor Ring. By F. W. Dyson, B.A., Fellow of Trinity 
College, Camhridge. Communicated by Professor J. J. Thomson, P\R.S. . 43 
III. Bakerian Lecture. — The Rate of Explosion in Gases. By Harold B. Dixon, 
M.A., F.R.S., late Fellow of Balliol College, Oxford; Professor of Chemistry 
in Owens College, Manchester .97 
IV. On the Residues of Powers of Numbers for any Composite Modulus, Real or 
Complex. By Geoffrey T. Bennett, B.A. Communicated by Professor 
Cayley, F.R.S . 189 
V. Ionic Velocities. By W. C. Dampier Whetham, B.A., Fellow of Trinity College, 
Cambridge. Communicated by Professor .1. .1. Thomson, F.R.S. . . . 337 
VI. The Value of the Mechanical Efjuivalent of Heat, deduced from some Experi¬ 
ments performed ivith the view of establishing the relation between the Electrical 
and Mechanical Units; together with an Investigation into the Capacity for 
Heat of Water at different Temperatures. By E. H. Griffiths, M.A., 
Assistant Lecturer, Sidney Sussex College, Cambridge. Communicated, by 
B. T. Glazebrook, F.R.S . 3G1 
c 2 
