10 JUL, 1830 
PHILOSOPHICAL 
TRANSACTIONS 
OF THE 
ROYAL SOCIETY 
LONDON. 
FOR THE YEAR MDCCCLXXXV. 
VOL. 176.-PART II. 
LONDON: 
PRINTED BY HARRISON AND SONS, ST. MARTIN’S LANE, W.C., 
in ©nhnnnr to Per §flujcstji. 
MDCCCLXXXVI. 
