The physician will probably be led by their contemplation to admit that the imagination has a larger share in the production of disease than he might, without a knowledge of the striking facts here recorded, have supposed to be within the limits of possibility. He has, no doubt, already observed, that joy will affect the circulation, grief the digestion; that anger will heat the frame as perniciously as ardent spirits, and that fear will chill it as certainly as ice; but he may not have carried his observation to the extent of perceiving, that not only single and transient effects, but specific diseases are produced through the agency of mental impressions, and he may therefore still be surprised to find that the dances of St. John and of St. Vitus, as they formerly spread by sympathy from city to city, gave rise to the same deviations from bodily health, in all the individuals whom they attacked; that Tarantism was the same disease, whether medically or morally considered, all over Italy; and that the “Lycanthropia,” of the past, and the “Leaping Ague” of the present times, have each its respective train of peculiar symptoms. The moralist will view these records of human frailty in a different light; he will examine the state of society which favoured the propagation of such maladies; he will inquire how far they have been the offspring of the ages in which they appeared, and although he may not be disposed to think with our author, that they can never return, he will at least deduce from the facts here laid before him, that they originate in those minds, whether ignorant or ill-educated, in which the imagination is permitted to usurp the power of sober sense, and the ideal is allowed to occupy the thoughts to the exclusion of the substantial.