For these reasons, it is not possible to enjoy fulness of life in a town. For grown-up people, the stimulus of town life does something to make up for the impurity of town air; as, on the other hand, country people too often forfeit their advantages through the habit of mental sluggishness they let themselves fall into: but, for the children – who not only breathe, but grow; who require, proportionably, more oxygen than adults need for their vital processes – it is absolutely cruel not to give them very frequent, if not daily, copious draughts of unvitiated, unimpoverished air, the sort of air that can be had only remote from towns.