t d 
Sir Ifaac Newton, Kt. 
PRESIDENT, 
And to the 
Council and Fellows 
OF THE 
Royal Society 
O F 
LONDON 
Inftituted for the 
Advancement of Natural Knowledge 
THIS 
Twenty Ninth VOLUME 
0 F 
Philofophical Tranfadions 
1 s . 
HUMBLY DEDICATED, 
B V 
Edmond Halley , R, S. Seer, 
Ml 3 
