Fig. 12From: Depicting the Tree of Life: the Philosophical and Historical Roots of Evolutionary Tree DiagramsLeft, Darwin’s first evolutionary diagram, drawn in his Notebook B in 1837 http://upload.wikimedia.org/wikipedia/en/8/83/Darwin_tree_of_life.jpg. Right, Darwin’s (1859: 116–7) hypothetical evolutionary diagram as it appeared in OriginBack to article page