Conversation so far:
what was Francis Galton known for doing?
Galton was a polymath who made important contributions in many fields of science.
what was one of his contributions?
Galton prepared the first weather map published in The Times.
is there anything interesting that happened during his Middle Years?
He became very active in the British Association for the Advancement of Science, presenting many papers.

Question: What was a topic of one of the papers he presented?
Self-contained rewrite: What was a topic of one of the papers Francis Galton presented to the British Association for the Advancement if Science?