PHILOSOPHICAL 
TRANSACTIONS 
OF THE 
ROYAL SOCIETY 
OF 
LONDON. 
FOR THE YEAR MDCCCXXVJ. 
PART IV. 
Printed at the Expence of the Board of Longitude. 
LONDON: 
PRINTED BY W. NICOL, SUCCESSOR TO W. BULMER AND CO. 
CLEVELAND-ROW, ST. JAMEs’s; 
AND SOLD BY G. AND W. NICOL, PALL-MALL, PRINTERS TO THE 
ROYAL SOCIETY. 
MDCCCXXVI 
