A similar phenomenon has been observed in the human species, who have been exposed to the effects of inordinate passion. Borrelli relates the case of a French gentleman, who was thrown into prison, and on whom fear operated so powerfully as to change his hair completely grey in the course of one night. Dr. Darwin ascribes this phenomenon to the torpor of the vessels, which circulates the fluids destined to nourish the hair. Nothing will, perhaps, demonstrate more fully the effects of moral causes in producing disease than the structural alterations discoverable in the bodies of those who have died whilst labouring under nostalgia, or the Swiss malady. This disease is considered peculiar to the Swiss, and is occasioned by a desire of revisiting their own country, and of witnessing again the scenes of their youth. This desire begins with melancholy sadness, love of solitude, silence, bodily weakness, &c. and is only cured by returning to their native country. Avenbrugger says, that in dissecting the bodies of those who have died in consequence of this disease, organic lesions of the heart generally are detected. A particular musical composition, supposed to be expressive of the happiness of the people, is in great vogue in Switzerland. If this tune or piece of music is played among the Swiss in any foreign country, it tends strongly to recall their affections for their native soil, and their desire of returning, and to induce the desire called nostalgia consequent on their disappointment. The effects of this musical composition is so powerful, that it is forbidden to be repeated in the French camp on pain of death, it having at one period had the effect of producing a mutiny among the Swiss soldiers, at that time in the employ of the French king. Predictions of death, whether supposed to be supernatural, or emanating from human authority, have often, in consequence of the poisonous effects of fear, been punctually fulfilled. The anecdote is well attested, of the licentious Lord Littleton, that he expired at the exact stroke of the clock, which in a dream or vision, he had been forewarned would be the signal of his departure. In Lesanky's voyage round the world, there is an account of a religious sect in the Sandwich Islands, who arrogate to themselves the power of praying people to death. Whoever incurs their displeasure, receives notice that the homicide litany is about to begin, and such are the effects of the imagination, that the very notice is frequently sufficient with these people to produce the effect. Thousands of other instances might be cited, illustrative of the fatal effects of inordinate indulgence in passion. [1] A cleverly conducted work containing more popular information on Medicine, Surgery, and what are termed the collateral sciences, than we are accustomed to find in a "professional" journal. [2] Rammazini. [3] Preface de Narcisse Oeuvres, Diverses, t. l. v. 172.