PHILOSOPPIIOAL 
RANSACTIONS 
OP THE 
ROYAL SOCIETY 
OP 
LONDON. 
(A.) 
FOR THE YEAR MDCCCLXXXIX. 
VOL. 180. 
LONDON: 
PRINTED BY HARRISON AND SONS, ST. MARTIN’s LANE, W.C., 
IjmiRrs iit #rbinarg to ^lajEslg. 
MDCCCXC. 
27 hlAR.90 
