PHILOSOPHICA L 
TRANSACTIONS, 
OF  THE 
ROYAL  SOCIETY 
O F 
LONDON. 
VOL.  LXVIIL  For  the  Year  17.78. 
PART  I. 
LONDON, 
PRINTED  BY  J,  NICHOLS,  SUCCESSOR  TO  MR.  BOWYER  ; 
FOR  LOCKYER  DAVIS,  PRINTER  TO  THE  ROYAL  SOCIETY. 
MDCCLXXIX 
