Continuous and discontinuous geometric proportion
Red-chalk diagram of proportional series linked by arcs
In red chalk Leonardo distinguishes 'continue' (continuous) proportion from 'geometrica discontinue' (geometric discontinuous) proportion. Series of numbers — 2 2, 2 4 8, and 2 4 10 20 — are written out and joined by arcs around a circle drawn on the sheet. The note studies the kinds of proportion rather than any object.
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Continuous versus discontinuous geometric proportion
The note labels one series 'continue' (continuous) — 2 2, then 2 4 8 — and another 'geometrica discontinue' (geometric discontinuous) — 2 4 10 20. Arcs link the successive terms around a drawn circle to show their proportional relations.