John Burroughs Quote

Evolution is not a mere process; it is a progress; it is not a circle, but a spiral.

Under The Apple Tree, A Prophet of the Soul (p. 226), Houghton Mifflin Co. 1916

Evolution is not a mere process; it is a progress; it is not a circle, but a spiral.

Evolution is not a mere process; it is a progress; it is not a circle, but a spiral.

Evolution is not a mere process; it is a progress; it is not a circle, but a spiral.

Evolution is not a mere process; it is a progress; it is not a circle, but a spiral.