To make quite sure of the reaction, the single sheet may be tried first, except in exceedingly violent cases, and the double sheet may be resorted to, if the single sheet prove inefficient. Or, should there be any doubt, the double sheet may be dipped in water of a higher temperature than that given above, say 55 to 60 deg.. With young and delicate children I prefer this course, especially if they be very excitable, and the shock of very cold water may be expected to be too much for their nerves. In these matters some discrimination should be used: it is always better we should keep on the safe side, and rather give a pack more than frighten the little patients out of their wits. Proceed safely, but firmly and try to obtain your object in the mildest manner possible. 69. Before perspiration comes on, there is a little more excitement for a few minutes (41), which must not induce the friends of the patient to take him out of the pack; only when it continues to increase, instead of the perspiration breaking out and relieving the patient, it will be necessary to change the sheet, another time, as in that case the organism is not fully prepared for perspiration. After the breaking out of the latter, the patient invariably feels easier, and continues so for some time. When the feverish symptoms increase, during perspiration, which can be ascertained by feeling the pulse on the temples and by the thermometer, it is time to remove the patient from the pack, to give him his bath. Half an hour's perspiration is commonly sufficient; if the patient feel easy, however, and can be prevailed upon to stay an hour, or longer, till a good thorough perspiration brings permanent relief, it will be better. It would be unwise to let the patient stay too long and get him in a state of over-excitement; but, on the other hand, parents ought to remember that very few children _like_ to be packed, and that a patient in high fever is a bad judge of his own case. I have always found those children the best patients, who had been brought up in strict obedience to their patients' dictates, before they were sick, and this, as well as the daily habit of taking baths, and the quiet and firm behavior of the physician and friends of the patient under treatment generally remove all difficulty. 70. LENGTH OF BATH.