Conversation so far:
what was Francis Galton known for doing?
Francis Galton was a polymath who made important contributions in many fields of science.
what was one of Francis Galton's contributions?
Francis Galton coined the phrase nature versus nurture. His book Hereditary Genius (1869) was the first social scientific attempt to study genius and greatness.

Question: is there anything interesting that happened during his Middle Years?
Self-contained rewrite: is there anything interesting that happened during Francis Galton's Middle Years?