A Cylinder Of Air Reaching

No Great Discovery Was Ever Made Without A Bold Guess.

If I Have Done The Public Any Service, It Is Due To My Patient Thought.

Do Not The Rays Of Light Which Fall Upon Bodies, And Are Reflected Or Refracted, Begin To Bend Before They Arrive At The Bodies; And Are They Not Reflected, Refracted, And Inflected, By One And The Same Principle, Acting Variously In Various Circumstances?

My Design In This Book Is Not To Explain The Properties Of Light By Hypotheses, But To Propose And Prove Them By Reason And Experiments: In Order To Which, I Shall Premise The Following Definitions And Axioms.

The Way To Chastity Is Not To Struggle Directly With Incontinent Thoughts But To Avert The Thoughts By Some Imployment, Or By Reading, Or Meditating On Other Things.