PHILOSOPHICAL 
TRANSACTIONS 
OF THE 
ROYAL SOCIETY OF LONDON. 
Series A 
CONTAINING PAPERS OF A MATHEMATICAL OE PHYSICAL CHARACTER. 
VOL. 199 
MU.sC>, 
' ^ S; . ' 
(TMMJ 
‘-'R - 
<i- , 
LONDON: 
PRINTED BY HARRISON AND SONS, ST. MARTIN’S LANE, W.C., 
printers in $ritinarg to gsis Pajistj. 
November, 1902. 
