PHILOSOPHICAL 
TRANSACTIONS, 
OF THE 
ROYAL SOCIETY 
O F 
LONDON. 
FOR THE YEAR MDCCCXX. 
PART I. 
LONDON, 
FEINTED BY W. BULMER AND W. NICOL, CLEVELAND BOW, ST. JAMEs’s; 
AND SOLD BY 6. AND W. NICOL, PALL-MALL, BOOKSELLERS TO HIS MAJESTY, 
AND PRINTERS TO THE ROYAL SOCIETY 
MDCCCXX, 
