TO

Sir Iſaac Newton, Kt.

PRESIDENT,

And to the

Council and Fellows

Royal Society

OF

L O N D O N

Inſtieuted for the

Advancement of Natural Knowledge;

THIS

Twenty Ninth VOLUME

OF

Philoſophical Tranſactions

IS

humbly dedicated,

BY

Edmond Halley, R.S. Secr.