These frequent changes in the mode of action are a necessity, and this necessity evidently unfits him for any kind of monotonous or continued exertion--the only kind which, in ordinary cases, can be made conducive to any useful results.
3.

Parents at home and teachers at school must recognize these physiological laws, relating to the action of the young, and make their plans and arrangements conform to them.

The periods of confinement to any one mode of action in the very young, and especially mental action, must be short; and they must alternate frequently with other modes.

That rapid succession of bodily movements and of mental ideas, and the emotions mingling and alternating with them, which constitutes what children call play, must be regarded not simply as an indulgence, but as a necessity for them.

The play must be considered as essential as the study, and that not merely for the very young but for all, up to the age of maturity.