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Balzac's amazing productivity has other sources besides copious quantities of caffine. It seems to be attributed to a. a lot of debts, b. the necessity of making more money and c. self-will.
In an interesting combination of tthe three, Balzac was once called to court, having recieved several advances on a novel that was due two months ago. He was charged and his extremely angry editor demanded a novel within twenty-four hours.
Balzac managed to extend his sentance to twenty-four days, filled said days with coffee and had a finished novel in twenty.
(He did, however, lock himself in a room for twenty-four hours with nothing besides his writing supplies, coffee and a chamberpot and produced a short story. The Amateur Historian would like to profess her total lack of surprise that Balzac had heart troubles later in life and eventually died of a heart attack.)