This blog has previously reproduced some of the unpublished sketches by Charles Darwin that involve tree-like relationships:
- Part 1 — collected notebooks and notes
- Part 2 — a letter to Charles Lyell
- Part 3 — a reconstruction from one of his books
Part 1 was updated to include three new sketches. I had previously encountered references to them but had not located them amongst the online Darwin documentation.
Part 2 was updated to include information from a paper on the same topic that was published several months after the blog post itself.