PHILOSOPHICA L 
TRANSACTIONS, 
OF THE 
ROYAL SOCIETY 
O F 
L O N D O N. 
VOL. LXIX. For the Year 1779* 
PART L 
LONDON, 
PRINTED BY J. NICHOLS, SUCCESSOR TO MR. ftOWYER 
i'OR. LOCKYER DAVIS, PRINTER TO THE ROYAL SOCIETY* 
MDCCLXXJ£. 
