THE inconvenience arifing from the great fcarcity of former editions of Sir Ifaac Newton's PRINCIPIA, and SYSTEM OF THE WORLD, added to the exorbitant prices charged for them when to be met with, determined the Editor to undertake a New Edition of thofe Works; and he is impreffed with confidence, that no other apology will be thought neceffary, at a time when Mathematics is become a fashionable science, and is looked upon as a neceffary acquifition in the polite world.

In compliance with the folicitations of feveral refpectable Mathematicians, to this Edition is added Mr. W. Emerfon's much admired COMMENT, and DEFENCE of Sir Ifaac Newton's PRINCIPIA, thereby rendering the Work more eafy of comprehenfion to students, and others, not fully acquainted with the higher branches of Mathematics; and the Editor is not without hope that the whole will be found generally correct :----PERFECTION he has not yet thought of afpiring to,

W, DAVIS,

London, January,

1803,