However, Perhaps The Main Point Is That

A Book That I Rate Only Second In Importance In Evolution Theory To Darwin 's Origin (this As Joined With Its Supplement Of Man), And Also Rate As Undoubtedly One Of The Greatest Books Of The Twentieth Century

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.

Natural Selection Is Not Evolution.

No Isolated Experiment, However Significant In Itself, Can Suffice For The Experimental Demonstration Of Any Natural Phenomenon; For The "one Chance In A Million" Will Undoubtedly Occur, With No Less And No More Than Its Appropriate Frequency, However Surprised We May Be That It Should Occur To Us.

[coining The Phrase "test Of Significance"] Critical Tests Of This Kind May Be Called Tests Of Significance, And When Such Tests Are Available We May Discover Whether A Second Sample Is Or Is Not Significantly Different From The First.