“At half-past seven the motions commenced again, when I was sent for. There were two drummers present, and an unbraced drum was beaten till the other was braced. She danced regularly to the unbraced drum, but the moment the other commenced she instantly ceased. As missing the time stopped the affections, I wished the measure to be changed during the dance, which stopped the attack. It also ceased upon increasing the rapidity of the beat, till she could no longer keep time; and it was truly surprising to see the rapidity and violence of the muscular exertion, in order to keep time with the increasing movement of the instrument. Five times I saw her sit down the same evening, at the instant that she was unable to keep the measure; and in consequence of this I desired the drummers to beat one continued roll, instead of a regular movement. She arose and danced five minutes, when both drums beat a continued roll: the motions instantly stopped, and the patient sat down. In a few minutes the motions commencing again, she was suffered to dance five minutes, when the drums again began to roll, the effect of which was instantaneous; the motions ceased, and the patient sat down. In a few minutes the same was repeated with the same effect. It appeared certain that the attacks could now be stopped in an instant, and I was desirous of arresting them entirely, and breaking the chain of irregular associations which constituted the disease. As the motions at this period always commenced in the fingers, and propagated themselves along the upper extremities to the trunk, I desired the drummers, when the patient arose to dance, to watch the commencement of the attack, and roll the drums before she arose from the chair. Six times successively the patient was hindered from rising, by attending to the commencement of the affection; and before leaving the house, I desired the family to attend to the commencement of the attacks, and use the drum early. “March 2. She arose at seven o’clock, and the motions commenced at ten; she danced twice before the drummer was prepared, after which she attempted to dance again four several times; but one roll of a well-braced drum hindered the patient from leaving her seat, after which the attacks did not recur. She was left weakly and fatigued by the disease, but with a good appetite. In the evening of this day an eruption appeared, particularly about the elbows, in diffused patches of a bright red colour, which went off on the third day.” Other cases might be adduced, (see 23d vol. of the Edinburgh Medical and Surgical Journal, p. 261; 31st vol. of ditto, p. 299; 5th vol. of the Medico-Chirurgical Transactions, pp. 1 to 23, &c.,) but as there is none more striking than this, they would unnecessarily swell this number of the Appendix, which has already extended to an undue length. VI.