CONTENTS. 
(A) 
VOL. 185.—PART I. 
I. On the Ratio of the Specif c Heats of the Paraffins, and their Alonohalogen 
Derivatives. By J. W, Capstick, M.Sc. [Viet.), B.A. {Camh.), Scholar and 
Coutts-Trotter Student of Trinity College, Cambridge. Coninmnicated by 
Professor J. J. Thomson, F.R.S .page 1 
IT. On a Special Form of the General Ecpialion of a Cubic Surface and on a 
Diagram Representing the Twenty-seven Lines on the Surface. By H. M. 
Taylor, M.A., Fellow of Trinity College, Cambridge. Communicated by 
A. It. Forsyth, Sc.D., F.R.S. . . .37 
in. Contributions to the Mathematical llieory of Evolution. By Karl Pearson, 
University College, London. Communicated by Professor Henrici, F.R.S. 71 
IV. A Certain Class of Generating Functions in the Theory of Numbers. By Major 
P. A. MacMahon, R.A., F.R.S .Ill 
V. Flame Spectra at High I'emperatures. —Part I. Oxy-hydrogen Blow-pipe Spectra. 
By W. N. Hartley, F.R.S. .161 
VI. On a Spherical Vortex. By M. J. M. Hill, M.A., D.Sc., Professor of Mathe- 
mcUics at University College, London. Communicated by Professor Henrici, 
F.R.S .213 
