PHILOSOPHICAL 
TRANSACTI 
EOTAL 
OF THE 
SOCIETY 
OF LONDON. 
Series A 
CONTAINING PAPERS OF A MATHEMATICAL OR PHYSICAL CHARACTER. 
FOR THE YEAR 1897. 
VOL. 190. 
LONDON: 
PRINTED BY HARRISON AND SONS, ST. MARTIN’s LANE, W.C., 
^rinPrs iit #rburarg to Pajtstg. 
1898. 
