This is the definitive reference for anyone who genuinely has an interest in the basic historical foundations of mathematics, physics, and cosmology. It is a heavy undertaking to study this book and I found myself somewhat lulled by my modern mathematical training into expecting equations and formal proofs via induction upon formulae. This book forms the basis for calculus and mathematical physics entirely on the foundation of geometry and nearly every proof is geometrical in origin. Having the guide as an integral part of this book helped to soften the transition from my more modern expectations and opened my mind to this great work of the past.