While the reduction of the food should be immediate and considerable, the increase should be very gradual. After a serious attack of acute indigestion, when beginning with milk again, it should not be made more than one fifth the original strength, and from ten days to two weeks should pass before the child is brought back to his original food, which should be done very gradually. It is surprising how long a time is required with young infants before they completely recover from an attack of acute indigestion, even though it did not seem to be very severe. The second disturbance always comes from a slighter cause than the first one. THE ADDITION OF OTHER FOODS TO MILK _How long should modified milk be continued without the addition of other food?_ This depends upon circumstances; usually, for about six months; but if the infant is thriving satisfactorily the milk may be used alone for ten or eleven months; with some infants who have especial difficulty in digesting cow's milk, it is advisable to begin the use of other food at three or four months or even from the outset. _What is the first thing to be used with milk?_ Farinaceous food in some form, usually as a gruel. _How are these gruels made?_ They may be made directly from the grains or from some of the prepared flours (page 149). The flours are usually to be preferred as being more simple of preparation. _How should they be used in making the food?_ They should be cooked separately, rather than with the milk; when the food is mixed, they take the place of a portion of the water in the formulas given on pages 70 and 71. _How much of the gruel should be used?_ If it is prepared as recommended on page 149, it may make according to circumstances from one sixth to one half the total quantity of food. _Which of the farinaceous foods are to be preferred?_ Those most used are barley, oatmeal, arrowroot, and farina. There is not much difference in their nutritive value; oatmeal gruel is somewhat more laxative. _What value do these substances possess as infant foods?_ Some of the starch is digested and absorbed; but the chief value of gruels is believed to be that when added to milk they render the curd more easily digested by preventing it from coagulating in the stomach in large tough masses. This is certainly true with many infants, but there are others who are not at all benefited, and not a few young infants whose digestion is made distinctly worse by the use of farinaceous food, particularly when employed in considerable quantity. The addition of gruels to milk for all infants is not to be recommended. _What further additions may be made to the diet of healthy infants during the first year?_ Beef juice, the white of egg, and orange juice. _How and when may beef juice be used?_