PHILOSOPHICAL 
TRANSACTIONS, 
. GF THE 
ROYAL SOCIETY 
O F 
LONDON. 
FOR THE YEAR MDCCCXV. 
PART II. 
LONDON, 
PRINTED EY W. BULMER AND CO. CLEVELAND-ROW, ST. JAMES’S ; 
AND SOLD BY G. AND W. NJCOL, PALL-MALL, BOOKSELLERS TO HIS MAJESTY, 
AND PRINTERS TO THE ROYAL SOCIETY. 
MDCCCXV. 
