PHILOSOPHICAL 
TRANSACTIONS 
OF THE 
ROYAL SOCIETY 
OF 
LONDON. 
(A.) 
FOR THE YEAR MDCCCLXXXVII. 
VOL. 178. 
LONDON: 
PRINTED BY HARRISON AND SONS, ST. MARTIN’S LANE, W.C., 
printers in ©rbinarg io Per Hlajestg. 
MDCCCLXXXYIIT. 
