PHILOSOPHICAL 
TRANSACTIONS 
OF THE 
KOYAL SOCIETY OF LONDON. 
Series A 
CONTAINING PAPERS OF A MATHEMATICAL OR PHYSICAL CHARACTER. 
FOR THE YEAR 1897. 
VOL. 189. 
LONDON: 
PRINTED BY HARRISON AND SONS, ST. MARTIN’s LANE, W.C., 
printers in Orbinarg to ''§tt Pajestg. 
1897. 
