The Man Who Walks With Henslow.

I Am Turned Into A Sort Of Machine For Observing Facts And Grinding Out Conclusions.

Mere Chance ... Alone Would Never Account For So Habitual And Large An Amount Of Difference As That Between Varieties Of The Same Species.

Each Organic Being Is Striving To Increase In A Geometrical Ratio . . . Each At Some Period Of Its Life, During Some Season Of The Year, During Each Generation Or At Intervals, Has To Struggle For Life And To Suffer Great Destruction . . . The Vigorous, The Healthy, And The Happy Survive And Multiply.

But Just In Proportion As This Process Of Extermination Has Acted On An Enormous Scale, So Must The Number Of Intermediate Varieties, Which Have Formerly Existed, Be Truly Enormous. Why Then Is Not Every Geological Formation And Every Stratum Full Of Such Intermediate Links? Geology Assuredly Does Not Reveal Any Such Finely Graduated Organic Chain; And This, Perhaps, Is The Most Obvious And Serious Objection Which Can Be Urged Against The Theory. The Explanation Lies, As I Believe, In The Extreme Imperfection Of The Geological Record.

If I Had Not Been So Great An Invalid, I Should Not Have Done So Much As I Have Accomplished.