To the intellectual training which results in the formation of tastes the formation of healthy habits of life must be added. These habits should be formed without, in general, giving any reason for them. Children should not be taught to reason on matters of Health. They utterly lack the power of proportion which is essential to reason, and they run the risk of becoming morbidly conscientious or hypochondriacal if compelled to reason on these practical matters. It is very important that they should go to sleep early, eat simple food, live in fresh air, and take a great deal of out-door exercise, but it is not desirable that they should know too early why they do these things. The proper time for reasoning on these habits has not arrived, but the healthy habits early formed will gradually become a part of their nature. Habits of self-control and obedience to rules are also an essential part of the moral hygiene of childhood; they prepare the nature for the intelligent obedience to law which should come in later years. Children should not be worried with unimportant observances. The precepts which it is necessary to give them will make more impressions if they are not too numerous; the rules laid down must be wise rules; children are trustful, and their trust must never be abused. If, as they grow older, they learn to recognise the wisdom of the obedience that has been exacted, they will escape that dangerous scepticism which so often comes to youth, who find that their intellectual and moral guides have cheated their youthful trust. Intellectual tastes, healthy habits, and obedience to law being thus formed in childhood, the youth is prepared for that full instruction in health which is adapted to the period where reason is developed.