I am above the forest region, amongst grand rocks & such a torrent as you see in Salvator Rosa’s paintings vegetation all a scrub of rhodos. with Pines below me as thick & bad to...

I expect to think that I would rather be author of your book [The Origin of Species] than of any other on Nat. Hist. Science.[Letter to Charles Darwin 12 Dec 1859]

I was aware of Darwin’s views fourteen years before I adopted them and I have done so solely and entirely from an independent study of the plants themselves.[Letter to W.H. Harvey]

In [David] Douglas’s success in life … his great activity, undaunted courage, singular abstemiousness, and energetic zeal, at once pointed him out as an individual eminently calculated to do himself credit as a scientific traveler.