PHILOSOPHICAL 
RANSACTION 
OF THE 
ROYAL SOCIETY 
OP 
LONDON. 
(B.) 
FOR THE YEAR MDCCCLXXXIX. 
VOL. 180. 
LONDON: 
PRINTED EY HARRISON AND SONS, ST. MARTIN’s LANE, W.C., 
printers in ©rbinarg to per ^ajestg. 
MDCCCXC. 
