PHILOSOPHICA L 



TRANSACTIONS, 



OF THE 



ROYAL SOCIETY 



O F 



O N D O N 



VOL. LXXV. For the Year 1785, 

 PART IL 



3a^BT^/e, 



LONDON, 



/ 



SOLD BY LOCKYER DAVIS, AND PETER ELMSLY, 

 PRINTERS TO THE ROYAL SOCIETY. 



MDCCLXXXV. 



