PHILOSOPHICAL 
TRANSACTIONS, 
OF THE 
ROYAL SOCIETY 
O F 
LONDON. 
VOL. LXXVIII. For the Year 1788. 
FART II. 
. a . 
LONDON, 
SOLD BY LOCKYER DAVIS, AND PETER ELM3LY, 
PRINTERS TO THE ROYAL SOCIETYc 
MDCCLXXX VIII. 
