PHILOSOPHICAL 
TRANSACTIONS, 
OF THE 
ROYAL SOCIETY 
o F 
LONDON. 
FOR THE YEAR MDCCCXIX. 
PART I. 
LONDON, 
FEINTED BY W. BULMER AND CO. CLEVELAND-ROW, ST. JAMES’S; 
AND SOLD BY G. AND W. NICOL, FALL-MALL, BOOKSELLERS TO HIS MAJESTY', 
AND PRINTERS TO THE ROYAL SOCIETY. 
MDCCCXIX, 
