PHILOSOPHICAL 
T R 
OF THE 
EOYAL SOCIETY OE 
LONDON, 
Series A 
CONTAINING PAPERS OF A SIATHEMATICAL OR PHYSICAL CHARACTER. 
VOL. 192. 
LONDON: 
PRINTED BY HARRISON AND SONS, ST. MARTIN’s LANE, W.U., 
printers iu ©rbhtarg lo '§tx 
1899. 
