Yet One Thing Secures Us What Ever

From What Has Been Said It Is Also Evident, That The Whiteness Of The Sun's Light Is Compounded All The Colours Wherewith The Several Sorts Of Rays Whereof That Light Consists, When By Their Several Refrangibilities They Are Separated From One Another, Do Tinge Paper Or Any Other White Body Whereon They Fall. For Those Colours ... Are Unchangeable, And Whenever All Those Rays With Those Their Colours Are Mix'd Again, They Reproduce The Same White Light As Before.

[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.

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.

Against Filling The Heavens With Fluid Mediums, Unless They Be Exceeding Rare, A Great Objection Arises From The Regular And Very Lasting Motions Of The Planets And Comets In All Manner Of Courses Through The Heavens.

To Every Action There Is Always Opposed An Equal Reaction.