[Ha Ha Thats Very Logical]

It’s purely a conceptual chart with no actual data points whatsoever.

Darwin explains that each capital letter represents species of a widespread genus, that each horizontal line represents a thousand generations (or even better, 10,000), and that each small letter-number combination represents a new variant in the species. That's pretty detailed. Can you apply similarly detailed labels to the degeneration chart?

[GodGunsGuts]

==Darwin explains that each capital letter represents species of a widespread genus

Hypothetical, no data

==that each horizontal line represents a thousand generations (or even better, 10,000)

Hypothetical, no data

==and that each small letter-number combination represents a new variant in the species

Hypothetical, no data