When The Adversaries Of Erasmus

Trials Are Medicines Which Our Gracious And Wise Physician Prescribes Because We Need Them; And He Proportions The Frequency And Weight Of Them To What The Case Requires. Let Us Trust His Skill And Thank Him For His Prescription.

This Excellent Mathematician Having Given Us, In The Transactions Of February Last, An Account Of The Cause, Which Induced Him To Think Upon Reflecting Telescopes, Instead Of Refracting Ones, Hath Thereupon Presented The Curious World With An Essay Of What May Be Performed By Such Telescopes; By Which It Is Found, That Telescopical Tubes May Be Considerably Shortened Without Prejudice To Their Magnifiying Effect. On His Invention Of The Catadioptrical Telescope, As He Communicated To The Royal Society.

Thus You May Multiply Each Stone 4 Times & No More For They Will Then Become Oyles Shining In Ye Dark And Fit For Magicall Uses. You May Ferment Them With Gold And Silver, By Keeping The Stone And Metal In Fusion Together For A Day, & Then Project Upon Metalls. This Is The Multiplication Of Ye Stone In Vertue. To Multiply It In Weight Ad To It Of Ye First Gold Whether Philosophic Or Vulgar.

As In Mathematicks, So In Natural Philosophy, The Investigation Of Difficult Things By The Method Of Analysis, Ought Ever To Precede The Method Of Composition. This Analysis Consists In Making Experiments And Observations, And In Drawing General Conclusions From Them By Induction, And Admitting Of No Objections Against The Conclusions, But Such As Are Taken From Experiments, Or Other Certain Truths. For Hypotheses Are Not To Be Regarded In Experimental Philosophy.

I Have Presented Principles Of Philosophy That Are Not, However, Philosophical But Strictly Mathematical-that Is, Those On Which The Study Of Philosophy Can Be Based. These Principles Are The Laws And Conditions Of Motions And Of Forces, Which Especially Relate To Philosophy.