PHILOSOPHICAL 
TRANSACTIONS, 
^ OF THE 
ROYAL SOCIETY 
LONDON. 
FOR THE YEAR MDCGGXI1. 
PART L 
LONDON, 
PRINTED BY W. BULMER AND CO. CLEVELAND-ROW, ST. JAMES'S; 
AND SOLD BY G. AND W. N1COL, PALL-MALL, BOOKSELLERS TO HIS MAJESTY, 
AND PRINTERS TO THE ROYAL SOCIETY. 
MDCCCXII. 
