PHILOSOPHICAL 
TRANSACTIONS, 
OF THE 
ROYAL SOCIETY 
OF 
LONDON. 
FOR THE YEAR MDCCCXIX. 
PART II. 
LONDON, 
PRINTED BY W. BULMER AND CO. CLEVELAND ROW, ST. JAMES’S ; 
AND SOLD BY G. AND \V. NICOL, PALL-MALL, BOOKSELLERS TO HIS MAJESTY, 
AND PRINTERS TO THE ROYAL SOCIETY. 
MDCCCXIX, 
