PHILOSOPHICAL 
TRANSACTIONS, 
OF THE 
ROYAL SOCIETY 
O F 
L O N D O N. 
s. 
VOL. LXXX. For the Year 1790. 
PART II. 
fc . 
- LONDON, 
BOLD BY LOCKYER DAVIS, AND PETER ELMSLY* 
PRINTERS TO THE ROYAL SOCIETY. 
MDCCXCI. 
