Darwin’s sketches: tree, coral, seaweed
Seventeen pre-1859 sketches were personal thinking tools, not public trees; they taught Darwin what the Origin diagram later taught readers.
Source
Trees, Coral, and Seaweed: An Interpretation of Sketches Found in Darwin's Papers
Inspect source passages
Darwin’s sketches: tree, coral, seaweed
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
Darwin’s papers contain 17 sketches executed before 1859.
Darwin’s collected papers contain 17 sketches executed before 1859, each one standing in a particular relation to the single diagram that appears in On the Origin of Species ()
How many sketches?
Darwin’s collected papers contain 17 sketches executed before 1859, each one standing in a particular relation to the single diagram that appears in On the
What they did
The author sequences the sketches, compares Voss, Bredekamp, and Archibald, and tracks points, lines, and spaces into the 1859 diagram.
What they found
Unlike others’ ladders, Darwin’s drawings were unpublished and heuristic. He tried tree, coral, and ‘endless seaweed dividing’. The ‘I think’ sketch is a prototype of later phylogenetic trees once time is bent onto a vertical axis.
The limits
What it doesn't show
This is an interpretation of drawings, not a new edition of Origin or a computational phylogeny.
Key terms
- Heuristic sketch
- A private drawing used to form ideas, not to publish a natural system.
- Origin diagram
- The sole figure in Origin, a didactic reworking of what the sketches had taught Darwin.
- Seaweed simile
- Darwin’s note that a tree was ‘not good’ and an endless dividing seaweed might be better.
- Phylogenetic prototype
- The ‘I think’ sketch as an early sample of branching affinity later standardised as trees.
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Quiz yourself
The pre-1859 drawings number?
Common questions
Were the sketches for print?
No. They had a personal, heuristic function.
Tree vs coral vs seaweed?
Darwin tested similes; at one point the tree was ‘not good’.
What did the Origin figure do?
It taught readers what the sketches had already taught Darwin.
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