PHILOSOPHICA L 



TRANSACTIONS, 



OF THE 



ROYAL SOCIETY 



O F 



LONDON 



VOL. LXXV. For the Year 1785. 



Sa^m/f . 



LONDON, 



tOtr> BY LOCKYER DAVIS, AND PETER ELMSLYj 

 PRINTERS TO THE ROYAL SOCIETY. 



MDCCLXXXV, 



