Since the advent of the vacuum-jacketed bottle, one of the uses to which it has been put is that of keeping a supply of baby's milk warm over several feeding-periods. From the standpoint of convenience, the idea of adopting this procedure, especially for night feeding, is attractive, as the troublesome process of warming the milk to the proper nursing-temperature at each feeding is thereby eliminated. The usual procedure is simply to warm a suitable quantity of properly modified milk to a temperature somewhat above that required for feeding and place the heated mixture in a vacuum bottle, which is then tightly stoppered and set aside until needed. The milk remains warm enough for feeding over a very considerable period of time.
From a bacteriologic standpoint, it becomes evident on reflection that this practice may or may not be safe
for the infant, according to whether the milk is kept at