PHILOSOPHICAL 
TRANSACTIONS 
OF THE 
ROYAL SOCIETY 
OF 
LONDON. 
FOE THE YEAE MDCCCLXXXYI. 
YOL. 177.—PART I. 
LONDON: 
PRINTED BY HARRISON AND SONS, ST. MARTIN’S LANE, W.C., 
Banters hr Orirmrtrji to f)er Utajestg. 
MDCCCLXXXYI. 
