The following table will serve as a guide: the fractions have been nearly all omitted, as unimportant, and somewhat confusing: —
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From the above table, we learn that the solid constituents of Ass's Milk are arranged in the same manner as human milk; and it therefore suggests itself as the most appropriate milk for infants' food. The great objection to this milk is the difficulty in obtaining it; for while, in some countries, the ass is found in abundance, in others it is hardly found at all, and, even in those countries where it is found in plenty, its milk is very expensive. Ass's milk being deficient in oily matters, it is suggested that a little cream (about the twentieth part) be added to it. This milk possesses also some laxative properties, which are not always desirable. To counteract such an effect, heat it to a boiling-point, and add about one-fourth of lime-water.
Cow's Milk is the next substitute, and the most generally adopted. But as this milk contains more caseine, and less sugar, than human milk, it is necessary to dilute it with water, and sweeten it with sugar.
