PHILOSOPHICAL 
TRANSACTION 
OF THE 
ROYAL SOCIETY 
OF 
LONDON. 
FOR THE YEAR MDCCCLXXXV. 
VOL. 170.—PART I. 
LONDON: 
PRINTED BY HARRISON AND SONS, ST. MARTIN’S LANE, W.C., 
|)rmfra in ©rbmnrjr to fjex pajcstg. 
MDCCCLXXXYI. 
