PHILOSOPHICAL 
TRANSACT 
OF THE 
IONS 
ROYAL SOCIETY 
OF LONDON. 
Series A. 
CONTAINING PAPERS OF A MATHEMATICAL OR PHYSICAL CHARACTER. 
VOL. 206. 
€\ 
•> , 
u \ 
LONDON: 
PRINTED BY HARRISON AND SONS, ST. MARTIN’S LANE, W.C., 
printers in ©rhinarg to fm lltajfstg. 
November, 1906. 
