PHILOSOPHICAL 



TRANSACTIONS 



OP THE 



ROYAL SOCIETY OF LONDON 



SERIES A. 



CONTAINING PAPERS OF A MATHEMATICAL OR PHYSICAL CHARACTER. 



VOL 204. 



LONDON : 



PRINTED BY HARRISON AND SONS, ST. MARTIN'S LANE, W.C., 



jLlrinttrs in firbinarg to $u 



JUNE, 1905. 



