PHILOSOPHICAL 
. i 
transaction s, 
4 
OF THE 
ROYAL SOCIETY 
O F 
L O N D O N. 
VOL. LXXX. For the Year 1790. 
PART I. 
LONDON, 
SOLD BY LOCK.YER DAVIS, AND PETER ELMSLTj 
PRINTERS TO THE ROYAL SOCIETY* 
MDCCXC. 
