These are, age, sex, size, season, conformation, and em-,loyment. Mr. Milner has shown, in reference to age, that a dietary better than that of the highest class in county prisons was excessive in old age, whilst it was insufficient to mnaintain the due growth of the body at the age of seventeen. Persons of unusual height, and of a girth of. thirty-four inches and upwards, lost weight in a rapidly increasing ratio. The duration of imprisonment had no marked influence. In reference to the waste

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... f carbon by the treadwvheel labour, Dr. Smith has proved that, with a quarter of an lhour's work, the increase over that of the state of rest was more than five times; and, with alternations of work and rest (luring seveni lhours and a half, it was three times. In reference to seasons, Dr. Smith has proved that the system is at its lowest state of vital action at the end of summer; and Mr. Mlilner has shown that his prisoners gain weight from May to September, and lose during the other tnonths. The general regulations recotnmencledl by the author, are as follows:-1. The supply of food must meet the waants of the system. 2. Variations in quantity of nutriment with duration of imprisourrnenit, and from day to day, are unnecessary; provided the qualntity at first supplied be suited to the wants of the system. 3. Growinig persons must lhave a sufficient excess of food to maintain the (levelopment of the system, whilst to old persons less food mlay be supplied. Persons of unusual size demand an increased supply of food. 4. FromI)ecember to April, both inclusive, the quantity of food should be one-sixth greater than during the other tmonths. 5. The stipp)ly must vary day by day with the, labour exacted. The breakfast should be as good a meal a-the dinner, and especially with hard labour; and the treadwheel should not be worked before breakfast. 6. Wlith halrd labour, the meals should not be too bulky, so as to iitnpede respiration. 7. Otlher things being equal, the cheapest articles should be preferred; and hence potato should be supplied more sparingly, and peas more plentifully. Dr. Smnith commends the use of unsifted flour-, grouind and tnade into bread, under efficient superintendence, in the prison. t5cbidoUs axn BoutiSs,