[An unpublished letter from Joseph Daquin: the draft of a diary on the insanes].

The author presents an unpublished letter from Joseph Daquin, a savoyard physician contemporary of Philippe Pinel to the minister Chaptal. This letter gives and outline of the practical researches lead by this other pioneer of psychiatry, on the relation to establish with the insane on one hand, on the influence of the moon on madness on the other hand.