... The Actual And Physical Conduct Of

Inductive Inference Is The Only Process Known To Us By Which Essentially New Knowledge Comes Into The World.

No Efforts Of Mine Could Avail To Make The Book Easy Reading.

We Have The Duty Of Formulating, Of Summarizing, And Of Communicating Our Conclusions, In Intelligible Form, In Recognition Of The Right Of Other Free Minds To Utilize Them In Making Their Own Decisions.

The Tendency Of Modern Scientific Teaching Is To Neglect The Great Books, To Lay Far Too Much Stress Upon Relatively Unimportant Modern Work, And To Present Masses Of Detail Of Doubtful Truth And Questionable Weight In Such A Way As To Obscure Principles.

It Was Darwin's Chief Contribution, Not Only To Biology But To The Whole Of Natural Science, To Have Brought To Light A Process By Which Contingencies A Priori Improbable, Are Given, In The Process Of Time, An Increasing Probability, Until It Is Their Non-occurrence Rather Than Their Occurrence Which Becomes Highly Improbable.