PHILOSOPHICAL 



TRANSACTIONS, 



OF THE 



ROYAL SOCIETY 



OF 



LONDON. 



FOR THE YEAR MDCGG. 



PART III. 



LONDON, 



PRINTED BY W. BULMER AND CO. CLEVELAND-ROW, ST. JAMEs's J 



AND SOLD BY PETER ELMSLY, 



PRINTER TO THE ROYAL SOCIETY, 



MDCCC. 



