MESMERISM. Contract between Antoine MESMER and the count de CHOISEUL-GOUFFIER (1752-1817, literary scholar, ambassador and minister), Paris April 5, 1784, signed by Choiseul-Gouffier; 1 page in-fol. partly printed. Rare contract. Mesmer undertakes to instruct the Count in the principles of "the Doctrine of Animal Magnetism [... which] is the property of M. MESMER its Author"; the pupil will not publish any treatise, will not make any teaching or public treatment...