I am almost convinced (quite contrary to opinion I started with) that species are not (it is like confessing a murder) immutable.

— Charles Darwin, The Life and Letters of Charles Darwin (1887)

Source: http://darwin-online.org.uk/content/frameset?pageseq=64&itemID=F1452.1&viewtype=image

From a letter to J.D. Hooker, 11 January 1844.

Topics: science