As might be expected, women who are frail are most susceptible to the strain of nursing, especially if they fail to get sufficient rest. All nursing mothers ought to have at least eight hours of sleep in the twenty-four. The night-feeding, generally advisable for the first six to eight weeks, does not break the mother's rest longer than half an hour if the baby is well trained. But if a baby that has not been properly trained turns night into day and keeps the mother awake for long intervals, the milk will quickly deteriorate. Under such circumstances someone must relieve the mother of the care of the infant during the night; she should not be disturbed even to nurse it. The night-feeding will then be supplied artificially; as will also one feeding during the day in order that the mother may have opportunity for exercise and diversion. THE SUPPLEMENTARY BOTTLE.--At first glance it may seem that in the suggestion that the infant be given one artificial feeding each day the mother's comfort alone has been considered. As a matter of fact, however, the adoption of the plan benefits mother and infant alike. The diversion and recreation which the mother, thus relieved of her maternal duties for from four to six hours, has time to secure becomes a direct benefit to the infant. Not infrequently by pursuing this plan, mothers who would otherwise be incapable of nursing are assured successful lactation. The child, moreover, having thus become accustomed to the bottle, is much more easily denied the breast when the time for weaning comes. Objections have been raised to giving the baby even one bottle when the mother has an ample supply of milk, but none of them are valid. Since cow's milk is acknowledged to be less easy of digestion than is human milk, it will occur to someone that there is danger of upsetting the baby by giving it a bottle. But this need not be feared; extensive experience has shown that if an infant is getting human milk of satisfactory quality at all its feedings during the twenty-four hours, save one or two, at these times it will digest properly modified cow's milk without the least inconvenience. Nor is it true that if once a day cow's milk is substituted for that of the mother, the infant will come to prefer the bottle to the breast. There is no danger, on the other hand, that the mother's milk will dry up. Very thorough investigation of these objections has failed to substantiate them in the least.