At any period of lactation there may be an overproduction of milk. In this event the breasts are likely to become distended, hard, and very tender. Most frequently "caked breasts," as this condition is called, develop a few days after delivery, when the secretion of milk is just beginning, for at first the secretion is more plentiful than need be. Generally twenty-four hours later there is an adjustment between the supply of nourishment and the natural demands of the infant. Occasionally a longer interval elapses before the breast is completely emptied at each nursing. Formerly it was customary, whenever the breasts became tense and uncomfortable, to express an excess of milk by means of massage; but this mode of treatment lost favor as soon as physicians realized that massage stimulated the glands to greater activity. Drawing the milk with a breast-pump has a somewhat similar though less potent influence, and, because pumping often affords relief when the breasts are distended, there is rarely any objection to it. In the light of modern experience, however, most physicians prefer to avoid manipulation of the breast so far as possible, and generally resort to other measures to relieve the mother's discomfort. Thus most patients are made comfortable if an appropriate bandage is used to transfer the weight of the breasts from the arm-pits and the front of the chest to the bones of the shoulder-girdle. It may be necessary also in some cases to swathe the breasts in warm cloths; in others cold applications are more acceptable; the choice between these methods will vary with the time of year, and usually may be left to the patient herself. Now and then medicine will be employed to relieve the pain, but the administration of drugs to diminish the production of milk is inadvisable. It is never very long before the amount of milk becomes adjusted to the infant's wants, and then distention disappears spontaneously. No artifice can bring about the adjustment as ideally as nature does. During the later months of lactation the liability of the breasts to over-filling is slight, provided the infant empties them regularly and completely. Nevertheless, so long as a mother is nursing her child she must be careful to keep the breasts in a healthful condition. They require support, yet must not be compressed. And they should be covered with clothing which will adequately protect them from sudden changes of temperature. This latter precaution, perhaps, requires more emphasis than formerly, on account of the present popularity of motoring; for the chill which one experiences when driving fast may have a very unpleasant effect upon a nursing mother unless her breasts are carefully protected. Occasionally fever and neuralgic pains in the breasts are caused by motoring, or by exposure to the air-current from an electric fan playing directly upon them. But even under these circumstances an abscess need not be feared unless the nipples are sore.