I read this book prior to taking test my school offered to "pass-out" of Calculus I and II. I assumed that this would be the best source since Newton is said to have invented Calculus in this book. I never saw it. I spent three weeks trying to cram this book, and I did not come close to passing the standardized exam. The test didn't resemble this book at all.If you need to learn Calculus or Physics, stick with a recently written book. If you need to learn some archaic way of expressing simple ideas, then this is the book for you.I'm now a second year medical student and I still don't know why I had to learn all that math. Nor do I know why I ever bothered to read this book. It turns out Physics and Calculus are really really simple things, but not if taught by Newton.