The Last Harvest by John Burroughs

How often it turns out that a man's minor works outlive his major! This is true in both literature and science, but more often in the former than in the latter. Darwin furnishes a case in the field of science. He evidently looked upon his "Origin of Species" as his great contribution to biological science; but it is highly probable that his "Voyage of the Beagle" will outlast all his other books. The "Voyage" is of perennial interest and finds new readers in each generation. I find myself re-reading it every eight or ten years. I have lately read it for the fourth time. It is not an argument or a polemic; it is a personal narrative of a disinterested yet keen observer, and is always fresh and satisfying. For the first time we see a comparatively unknown country like South America through the eyes of a born and trained naturalist. It is the one book of his that makes a wide appeal and touches life and nature the most closely.

We may say that Darwin was a Darwinian from the first, -- a naturalist and a philosopher combined, -- and was predisposed to look at animate nature in the way his works have since made us familiar with.