The inward force will soon begin to struggle within him to find an issue.

But if, while he is so sitting, we begin to relate to him some very surprising or exciting story, to occupy his _mind_, he will become motionless, and very likely remain so until the story is ended.

It is supposed that in such cases the force is drawn off, so to speak, through the cerebral organs which it is employed in keeping in play, as the instruments by which the emotions and ideas which the story awakens in the mind are evolved.

This part of the subject, as has already been remarked, is full of mystery; but the general fact that a portion of the force derived from the food is expended in actions of the brain and nervous system seems well established.
Indeed, the whole subject of the reception and the storing up of force from the sun by the processes of vegetable and animal life, and the subsequent liberation of it in the fulfillment of the various functions of the animal system, is full of difficulties and mysteries.

It is only a very simple view of the _general principle_ which is presented in these articles.