Saccharine. The sugar of the milk represents several substances obtained from plants and used as food. Sugar itself varies in its composition according to its sources; hence we have cane-sugar, grape-sugar, maple-sugar, etc. Sugar has also a composition nearly approaching that of starch, and this substance is very generally found in the vegetable diet of man; pure in the form of arrow-root, tapioca, and sago; combined in the flour of wheat, and other cereal grasses. Of all the animal products used as food, sugar is found alone in milk.