PHILOSOPHICAL 
transactions, 
OF THE 
ROYAL SOCIETY 
O F 
\ 
LONDON. 
V O L. LXXVII. For the Year 1787. 
PART II. 
• Awrr /r . 
LONDON, 
SOLD BY LOCKYER DAVIS, AND PETER ELMSLY, 
PRINTERS TO THE ROYAL SOCIETY. 
MDCCLXXX VII* 
