All Faculties Are Strengthened by Exercise—Children and youth who are kept at school and confined to books cannot have sound physical constitutions. The exercise of the brain in study, without corresponding physical exercise, has a tendency to attract the blood to the brain, and the circulation of the blood through the system becomes unbalanced. The brain has too much blood, and the extremities too little. There should be rules regulating the studies of children and youth to certain hours, and then a portion of their time should be spent in physical labor. And if their habits of eating, dressing, and sleeping are in accordance with physical law, they can obtain an education without sacrificing physical and mental health.