PHILOSOPHICAL 
TRANSACTION 
OF THE 
ROYAL SOCIETY 
OF 
LONDON. 
FOR THE YEAR MDCCCLXXXIY. 
VOL. 175. 
LONDON: 
PRINTED BY HARRISON AND SONS, ST. MARTIN’S LANE, W.C., 
iprinfm in (Srbiirarg to |ptr Utajcstg. 
MDCCCLXXXV. 
