PHILOSOPHICA L 
TRANSACTIONS, 
OF THE 
ROYAL SOCIETY 
O F 
LONDON. 
/ 
V O L. LXVII. For the Year 1777. 
P A R T I. 
L O N D O N, 
PRINTED BY W. .BOWYER AND J. NICHOLS :: 
FOR LOCKYER DAVIS, PRINTER TO THE ROYAL SOCIETY, . 
MDCCLXXVII. . 
