Natural Selection Is Not The

This Substance, Which Is Manifold In Its Forms And Protean In Its Transformations, Has, In Its State Of Living Matter, One Physiological Name Which Has Become Familiar, That Of Protoplasm.

This View, As A Rounded Whole And In All Its Essential Elements, Has Very Recently Disappeared From Science. It Died A Royal Death With Agassiz.

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.

Many Years Ago It Was Taught That Plants And Animals Were Composed Of Different Materials: Plants, Of A Chemical Substance Of Three Elements,- Carbon, Hydrogen, And Oxygen; Animals Of One Of Four Elements, Nitrogen Being Added To The Other Three.

It Was Implicitly Supposed That Every Living Thing Was Distinctively Plant Or Animal; That There Were Real And Profound Differences Between The Two, If Only They Could Be Seized.