philosophica l 
transactions, 
OF THE 
royal society 
O F 
LON D O N. 
^ O T. LXXII. For tlie Year 1782, 
PARTI, 
LONDON, 
SOLD BY LOCKYER DAVIS, AND PETER ELMSLY, 
PRINTERS TO THE ROYAL SOCIETY* 
Is MDCCLXXXII. 
