PHILOSOPHICA L 



TRANSACTIONS, 



OF THE 



ROYAL SOCIETY 



O F 



O N D O N. 



V O L. LXXV. For the Year 1785, 

 PARTI, 



Samre/e. 



LONDON, 



IIOLD BY LOCKYER DAVIS, AND PETER ELMSLY, 

 PRINTERS TO THE ROYAL SOCIETY. 



MDCCLXXXV. 



