An ideal proportion of the three food elements is to be had only in the middle compartment of the lowest row. But it is by no means necessary or advisable to confine one's diet to the few foods which happen to fall in that compartment, provided foods chosen from other compartments _balance_ each other. Thus, fruit and nuts balance each other, the one being at the left and the other at the right of the ideal compartment. In the same way, potatoes and cream balance each other, as do bread and butter. Instinctively these combinations have been chosen, especially bread and butter. This combination is, however, slightly too low in protein, and a better balance is obtained by adding a little from the compartment vertically above the ideal. In this way we obtain the familiar meat-, egg-, or cheese-sandwich, constituting of itself a fairly well-balanced meal. In short, in order to maintain a diet correct as to protein, it is only necessary to make our main choices from the lowest row and, in case the foods so chosen are near the bottom, to supplement these by a moderate use from the row above and a still more sparing use of those in the top compartment. The following more detailed and specific table of food values will prove helpful to those who desire intelligently to balance their diet or to provide balanced menus for their families. A very little attention to this subject will enable one to acquire sufficient knowledge of dietetic needs to successfully govern the diet in a general way without weighing or measuring the food. In the following table the number of calories available in ordinary food portions is stated. Such a table should not, of course, be memorized, but an occasional reference to it will enable one soon to acquire a working knowledge of the food values of the main articles in the dietary. TABLE OF FOOD VALUES