PHILOSOPHICAL 
T R A N S A C 
OF THE 
T I O N S 
EOYAL SOCIETY OE LONDON. 
Series A. 
CONTAINING PAPERS OF A MATHEMATICAL OR PHYSICAL CHARACTER. • 
VOL. 196. 
LONDON: 
PRINTED BY HARRISON AND SONS, ST. MARTIN’s LANE, W.C., 
priutirs in ©rbinarg to ptr late pajestg. 
JULY, 1901. 
Price Thirty-one Shillings. 
