PHILOSOPHICAL 



TRANSACTIONS, 



OF THE 



ROYAL SOCIETY 



OF 



LONDON. 



FOR THE YEAR MDCCCXIII. 



PART II. 



LONDON, 



PhlNTED BY W. BULMEB AND CO. CLEVELAND-ROW, ST. JAMEs's; 



AND SOLD BY G. AND W. NICOL, PALL-MALL, BOOKSELLERS TO HIS MAJESTY, 



AND PRINTERS TO THE ROYAL SOCIETY. 



MDCCCXIII. 



