Thank you, Susie!

[...] have many such examples, and one amongst the rest of a baker in Ferrara that thought he was composed of butter, and durst not sit in the sun, or come near the fire for fear of being melted:

Robert Burton, The Anatomy of Melancholy

I am grateful to Countdown's Susie Dent, whose 'origins of words' spot this afternoon pointed me to the source of these words, which I know as the preamble to Dr. Dim And Dr. Strange (on YouTube). (After this, the two texts diverge, but I'm guessing that this is a matter of editing.)

Now I wonder why I've never managed to find it before (oh, I have searched). Or even why I didn't guess the source.