PHILOSOPHICAL 



TRANSACTIONS 



OF THE 



EOYAL SOCIETY OF LONDON 



SERIES A 



CONTAINING PAPERS OF A MATHEMATICAL OK PHYSICAL CHARACTER. 



VOL. 191. 



LONDON: 



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

 printers in rbiitarg to <$ tr Pajwig. 



1898. 



