Billy discovered suddenly that potatoes, beef, onions, oranges, and puddings were something besides vegetables, meat, fruit, and dessert.

They possessed attributes known as proteids, fats, and carbohydrates.

Faint memories of long forgotten school days hinted that these terms had been heard before; but never, Billy was sure, had she fully realized what they meant.
It was at this juncture that Billy ran across a book entitled "Correct Eating for Efficiency." She bought it at once, and carried it home in triumph.

It proved to be a marvelous book.

Billy had not read two chapters before she began to wonder how the family had managed to live thus far with any sort of success, in the face of their dense ignorance and her own criminal carelessness concerning their daily bill of fare.
At dinner that night Billy told Bertram and William of her discovery, and, with growing excitement, dilated on the wonderful good that it was to bring to them.
"Why, you don't know, you can't imagine what a treasure it is!" she exclaimed.