Agassiz, When I Saw Him Last, Had

The Former Conviction That These Two Kingdoms Were Wholly Different In Structure, In Function, And In Kind Of Life, Was Not Seriously Disturbed By The Difficulties Which The Naturalist Encountered When He Undertook To Define Them.

I Accept Extinction As Best Explaining Disjoined Species. I See That The Same Cause Must Have Reduced Many Species Of Great Range To Small, And That It May Have Reduced Large Genera To So Small, And Of Families.

Natural Selection Is Not The Wind Which Propels The Vessel, But The Rudder Which, By Friction, Now On This Side And Now On That, Shapes The Course.

Yes, It Is True That There Are Times When You Do Wonder If Things Are Worth It But Usually Those Moments Pass As Soon As They Have Come.

Indeed Upon Much That May Have To Say, I Expect Rather The Charitable Judgment Than The Full Assent Of Those Whose Approbation I Could Most Wish To Win.