é“t 
RPerEtos.0 FH ICA L 
TRANSACTIONS, 
ROYAL SOCIETY 
ino N D ON, 
VOL. LXXIV. For the Year 1784. 
PAR FOL 






































Lon Dp ON, 
SOLD BY LOCKYER DAVIS, AND PETER ELMSLY;: 
PRINTERS TO THE ROYAL SOCIETY. 
MDCCLEXXIV, 
