Nature Will Tell You A

I Have Called This Principle, By Which Each Slight Variation, If Useful, Is Preserved, By The Term Natural Selection, In Order To Mark Its Relation To Man's Power Of Selection. But The Expression Often Used By Mr. Herbert Spencer Of The Survival Of The Fittest Is More Accurate, And Is Sometimes Equally Convenient.

It Is Really Laughable To See What Different Ideas Are Prominent In Various Naturalists' Minds, When They Speak Of 'species'; In Some, Resemblance Is Everything And Descent Of Little Weight-in Some, Resemblance Seems To Go For Nothing, And Creation The Reigning Idea-in Some, Descent Is The Key,-in Some, Sterility An Unfailing Test, With Others It Is Not Worth A Farthing. It All Comes, I Believe, From Trying To Define The Undefinable.

But Geology Carries The Day: It Is Like The Pleasure Of Gambling, Speculating, On First Arriving, What The Rocks May Be; I Often Mentally Cry Out 3 To 1 Tertiary Against Primitive; But The Latter Have Hitherto Won All The Bets.

The Most Important Factor In Survival Is Neither Intelligence Nor Strength But Adaptability.

Nothing Is Easier Than To Admit In Words The Truth Of The Universal Struggle For Life, Or More Difficult--at Least I Have Found It So--than Constantly To Bear This Conclusion In Mind.