PHILOSOPHICAL 
TRANSACTIONS, 
OF THE 
ROYAL SOCIETY 
OF 
LONDON. 
FOR THE YEAR MDCCCXV* 
PART I. 
LONDON, 
PRINTED BY W. BULMER AND CO. CLEVELAND-ROW, ST. JAMES’S 
AND SOLD BY G. AND W. N1COL, PALL-MALL, BOOKS ELLERS TO HIS MAJESTY, 
AND PRIHTERS TO THE ROYAL SOCIETY. 
MDCCCXV. 
