On Mar 9, 5:01*pm, "William Sommerwerck"
wrote:
"Robbie Hatley = mad as a Hatter "
Hatters have no more likelyhood of being "mad" (either insane
or merely angry) than persons of any other profession.

Mercury poisoning, from the compounds using in felting.

I recall it's from the mercury fumes. There was a region in south bay,
CA called cinnabar, always thought the people form that region were a
bit odd, now I know why.

Yet, ingesting mercury causes nephritis, as in Madame Bovary, go
figure.