PHILOSOPHICAL 
TRANSACTION 
OP THE 
ROYAL SOCIETY 
OP 
LONDON. 
FOR THE YEAR MDCCCLXXXIY. 
YOL. 175.—PART I. 
LONDON: 
PIUNTED BY HARRISON AND SONS, ST. MARTIN’S LANE, W.C., 
larmiers in ©rbinarg to Per Hlajestg. 
MDCCCLXXXIY. 
