Great attention is also necessary in regulating the heat of the bath; for if it is not sufficiently warm, it will not have the effect of producing a due relaxation; and if it should be too hot, it will stimulate too much, and will have the farther inconvenience of making the patient very faint in a short time. It cannot be well regulated without a thermometer, and 93° upon Fahrenheit’s scale is perhaps the best temperature. I have kept a patient in a bath of that heat for six hours, which he could not have endured for half an hour had the heat been three or four degrees higher. The circumstance next in consequence, in the cure of this complaint, is the keeping up a moisture on the skin, and guarding the surface of the body from the access of the air. This is particularly necessary with regard to the part itself, which should be constantly enveloped in warm, anodyne, and emollient applications. The good effects of this is particularly exemplified in the case which recovered under the care of Mr. Harris, who gave the diaphoretic medicine, composed of antimonial wine and laudanum, and applied the anodyne cataplasm to the external _fauces_. It was remarked, that the locked jaw was most incident to those wounded men who lay in parts of the hospital where they were exposed to a current of air; and the cases of tetanus that most usually occur in the West Indies, independent of wounds, are those of slaves who fall asleep in the night-time in the open air. Since the first edition of this work, there has appeared an Essay on the Locked Jaw by Dr. Rush, physician to the American army in the late war, in which he recommends, from his own observation, Peruvian bark, wine, and blisters, and to dress the wounds with mercurial ointment, in the cure of this complaint. From some trials I have since made of the bark in St. Thomas’s hospital, I have reason to think well of it as a remedy in this disease.