[ xvii ] 
XVIL Memoir on the Theory of the Comjjositions of Numbers. By P. A, MacMahon, 
Major R.A., F.R.S. . . page 835 
XVIII. On the Evidences of a Submergence of Western Europe, and of the Mediter¬ 
ranean Coasts, at the Close of the Glacial or so-called Post-glacial Period, 
and immediately preceding the Neolithic or Recent Period. By Joseph 
D.C.L., F.R.S., F.G.S., Corr. Inst, of France, &c. . . . 903 
XIX. Magnetic Qualities of Iron. By J. A. Ewing, M.A., F.R.S., Professor of 
Mechanism and Applied Mechanics in the University of Cambridge, and Miss 
Helen G. Klaassen, Lecturer in Physics, Newnham College . . . . 985 
XX. The Potentied of an Anchor Ring. — Part II. By F. W. Dyson, M.A., Fellow 
of Trinity College, Cambridge, Isaac Neivton Student in the University of 
Cambridge. Communicated by Professor J. J. Thomson, F.R.S. . . 1041 
XXI. On the Annual and Semi-Annued Seismic Periods. By Chaeles Davison, 
M.A., Mathematiced Master at King Edivard’s High School, Birmingham. 
Communicated by Professor J. H. Poynting, F.R.S. . 1107 
XXII. On the Differenticd Covariants of Plane Curves, and the Operators employed 
in their Development. By Pv. F. Gwythee, M.A., Fielden Lecturer in Mathe¬ 
matics, Owens College, Manchester. Communicated by Professor Hoeace 
Lamb, F.R.S . 1171 
Index 
1215 
