Von Hentig wrote his book in the 1930's or so. He was a bolshevik and must run Germany when Hitler reached power. Kretschmer wrote his later, after 1946...I don't know exactly the year. He was an expert in "morphologic psychology". He supported the idea that a physical morphology will be followed for a certain psychological behavior. For Kretschmer, Danton was an "athletic" and Robespierre an "asthenic"...and like some asthenix he could easily be an esquizoid...Oh, well.

If you have the Nabonne, please read the first part of the book. It's priceless in the bad sense of the word. The anecdote of the pigs made me laugh. I know I must not...but the whole idea is so idiotic that I couldn't help it.

I think that Robespierre's "insanity" must come from some Thermidorian pamphlets. Some of them are just unbelievable and ridicoulous...but some people still takes them seriously. Fréron pointed out that Maxime was always clenching his fist and had a lot of facial tricks and would walk nervously....maybe some "historians" took these depiction to assert that Maximilien was insane