PHILOSOPHICAL 
TRANSACTIONS 
OF THE 
ROYAL SOCIETY 
OF 
LONDON. 
FOR THE YEAR MDCCCLXXX. 
VOL. 171.—PART I. 
LONDON: 
PRINTED BY HARRISON AND SONS, ST. MARTIN^ LANE, W.C., 
■printers in (Drimtarg to per gtTajestg. 
MDCCCLXXX. 
