The Author's Preface
found out after the reſt, I choſe to inſert in places leſs ſuitable, rather than change the number of the propoſitions and the citations. I heartily beg that what I have here done may be read with candor; and that the defects I have been guilty of upon this difficult ſubject may be not ſo much reprehended as kindly ſupplied, and inveſtigated by new endeavors of my readers.
- Cambridge, Trin. College,
- May 8. 1686.
- Iſ. Newton.
- May 8. 1686.
- Cambridge, Trin. College,
In the ſecond Edition, the ſecond Section of the firſt book was enlarged. In the ſeventh Section of the ſecond Book the theory of the reſiſtances of fluids was more accurately inveſtigated, and confirmed by new experiments. In the third Book, the Moon's Theory and the Præceſſion of the Æquinoxes were more fully deduced from their principles; and the theory of the Comets was confirmed by more examples of the calculation of their orbits, done alſo with greater accuracy.
