*''"I am sure to be in error in many parts; but my general view, I conclude, must have some truth in it"''<ref>{{cite web |title=Darwin, C. R. to Gray, Asa 24 Dec [1859]|publisher=the University of Cambridge Darwin Correspondence Project|accessdate=17-Mar-2013|url=http://www.darwinproject.ac.uk/entry-2599}}</ref> | *''"I am sure to be in error in many parts; but my general view, I conclude, must have some truth in it"''<ref>{{cite web |title=Darwin, C. R. to Gray, Asa 24 Dec [1859]|publisher=the University of Cambridge Darwin Correspondence Project|accessdate=17-Mar-2013|url=http://www.darwinproject.ac.uk/entry-2599}}</ref> |