Physics, Beware Of Metaphysics.

Do Not Several Sorts Of Rays Make Vibrations Of Several Bignesses, Which According To Their Bigness Excite Sensations Of Several Colours, Much After The Manner That The Vibrations Of The Air, According To Their Several Bignesses Excite Sensations Of Several Sounds? And Particularly Do Not The Most Refrangible Rays Excite The Shortest Vibrations For Making A Sensation Of Deep Violet, The Least Refrangible The Largest Form Making A Sensation Of Deep Red, And Several Intermediate Sorts Of Rays, Vibrations Of Several Intermediate Bignesses To Make Sensations Of Several Intemediate Colours?

I Have Been Much Amused At Ye Singular Phenomena Resulting From Bringing Of A Needle Into Contact With A Piece Of Amber Or Resin Fricated On Silke Clothe. Ye Flame Putteth Me In Mind Of Sheet Lightning On A Small-how Very Small-scale.

Centripetal Force Is The Force By Which Bodies Are Drawn From All Sides, Are Impelled, Or In Any Way Tend, Toward Some Point As To A Center.

A Body In Motion Tends To Stay In Motion Unless Acted On By An Outside Force.

[1.] And First I Suppose That There Is Diffused Through All Places An Aethereal Substance Capable Of Contraction & Dilatation, Strongly Elastick, & In A Word, Much Like Air In All Respects, But Far More Subtile. 2. I Suppose This Aether Pervades All Gross Bodies, But Yet So As To Stand Rarer In Their Pores Then In Free Spaces, & So Much Ye Rarer As Their Pores Are Less ... 3. I Suppose Ye Rarer Aether Within Bodies & Ye Denser Without Them, Not To Be Terminated In A Mathematical Superficies, But To Grow Gradually Into One Another.