In The World Of Letters,

It Seems Safe To Look Forward To The Time When The Conception Of Attractive And Repulsive Forces, Having Served Its Purpose As A Useful Piece Of Scientific Scaffolding, Will Be Replaced By The Deduction Of The Phenomena Known As Attraction And Repulsion, From The General Laws Of Motion.

In Fact A Favourite Problem Of Tyndall Is-given The Molecular Forces In A Mutton Chop, Deduce Hamlet Or Faust Therefrom. He Is Confident That The Physics Of The Future Will Solve This Easily.

Life Is Like Walking Along A Crowded Street--there Always Seem To Be Fewer Obstacles To Getting Along On The Opposite Pavement--and Yet, If One Crosses Over, Matters Are Rarely Mended.

My Experience Of The World Is That Things Left To Themselves Don't Get Right.

I Have Endeavoured To Show That No Absolute Structural Line Of Demarcation, Wider Than That Between The Animals Which Immediately Succeed Us In The Scale, Can Be Drawn Between The Animal World And Ourselves; And I May Add The Expression Of My Belief That The Attempt To Draw A Physical Distinction Is Equally Futile, And That Even The Highest Faculties Of Feeling And Of Intellect Begin To Germinate In Lower Forms Of Life.