PHILOSOPHICAL 
TRANSACTIONS 
OF THE 
EOTAL SOCIETY OE LONDON. 
Series A 
CONTAINING PAPERS OF A MATHEMATICAL OR PHYSICAL CHARACTER. 
VOL. 197. 
LONDON: 
PRINTED BY HARRISON AND SONS, ST. MARTIN’s LANE, W.C., 
printers in Grbinarg to ^is Pajjestg. 
December, 1901. 
Price Thirty-five Shillings. 
