In childhood, when the stress of Nature's expansive forces is strongest, the neglect of exercise will, for obvious reasons, have most serious consequences.

If a healthy child were kept in bed during the second and third years of his life, the damage done to his whole body would be incalculable.
These are glaring truisms.

Let me perpetrate one more,--one which is perhaps the most glaring of all.

The process of growing must be done by the growing organism, by the child, let us say, and by no one else.

The child himself must take in and assimilate the nourishment that is provided for him.