Lightning, Making Rain

One thing Emma -- the speaker of the Six Lectures in 1860 -- and TAOAM had in common was their (completely mistaken) belief that rain was produced by lightning.

I am not sure how I am going to determine whether that idea was prevalent or not, but it's interesting.

More interesting is the feeling of rehearsal one gets reading Six Lectures and Art Magic back-to-back or in parallel -- particularly the first lecture in Six Lectures.