PHILOSOPHICAL 
TRANS ACTIO NS 
OF THE 
ROYAL SOCIETY 
OF 
LONDON. 
FOR THE YEAR MDCCCXXVIL 
PART IL 
LONDON: 
FEINTED BY W, NICOL, SUCCESSOR TO W, BULMEE AND CO. 
CLEVELAND-ROW, ST. Ji^MEs’s; 
AND SOLD BY G. AND W. NICOL, PALL-MALL, PEINTEES TO THE 
EOYAL SOCIETY. 
MDCCCXXVIL 
