From careful experiments made, under direction of the Board of Directors of Prisons in Scotland, on 1624 prisoners confined in eight of the principal prisons, for periods not exceeding sixty days; and from an analysis of numerous observations on their weight and general health, the author arrives at the following conclusions:—

1. For the average of people whose occupation involves moderate muscular effort and no great exercise, a simple, well-selected sort of food, supplying seventeen ounces of daily real nutriment, of which four ounces are nitrogenous principles, constitutes a sufficient diet for maintaining health, strength, weight, and general condition; but less is not sufficient.