PHILOSOPHICAL 
TRANSACTIONS, 
OF THE 
ROYAL SOCIETY 
LONDON. 
FOR THE YEAR MDCCCXI. 
PART IL 
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. 
MDCCCXI. 
I 
