“Fatigue is almost always complained of after violent paroxysms, and sometimes a general soreness is experienced. The heart and arteries appear to be no further affected by the disease, than what arises from the exercise of the body; nor does any change take place in any of the secretions or excretions. It has not proved mortal in a single instance within my knowledge, but becomes lighter by degrees, and finally disappears. In some cases, however, of long continuance, it is attended with some degree of melancholia, which seems to arise entirely from the patient’s reflections, and not directly from the disease. “The state of the atmosphere has no influence over it, as it rages with equal violence in summer and in winter; in moist and in dry air.” In the above examples, nervous disorders bearing a strong resemblance to those of the middle ages, are shown to exist in an _epidemic_ form, both in Europe and America, at the present time; but in these instances some general cause of mental excitement—and none is more powerful than religious enthusiasm—seems to have been requisite for their propagation. Their appearance, however, in _single cases_, is occasionally independent of any such origin, which leads to a belief, not without support in the experiments of modern physiologists, that they occasionally proceed from physical causes, and that it is therefore not necessary to consider them in all cases as the offspring of a disordered imagination. A well marked case of a disease approximating to the original Dancing Mania, is related by Mr. Kinder Wood, in the 7th volume of the Medico-Chirurgical Transactions, p. 237. The patient, a young married woman, is described to have suffered from headache and sickness, together with involuntary motions of the eyelids, and most extraordinary contortions of the trunk and extremities, for several days, when the more remarkable symptoms began to manifest themselves, which are thus recorded:—