PHILOSOPHICAL 
TRANSACTIONS 
OF THE 
EOYAL SOCIETY OE LONDON 
Series A 
COKTAINIKG PAPERS OF A MATHEMATICAL OR PHYSICAL CHARACTER. 
VOL. 192. 
^ V 
/■ ,«r. \ 
• 1 
LONDON: 
PKINTED BY HARRISON AND SONS, ST. MARTIN’s LANE, W.C., 
printers in (irbinarn to '^n ^ajesig. 
1899. 
