d x ft 
PHILOSOPHICAL 
TRANSACTIONS 
OF THE 
ROYAL SOCIETY 
LONDON. 
FOR THE YEAR MDCCCLXXXIII. 
YOL. 174.—PART I. 
LONDON: 
PRINTED BY HARRISON AND SONS, ST. MARTIN’S LANE, W.C., 
printers in (SDrbinarg to fjtr Paj^stg. 
MDCCCLXXXIII. 
