But the centre of this cohesion, this correlation, this cooperation, is the Head. Here resides the power which controls, commands, animates, harmonizes the whole. Through orders transmitted from this central government, each part receives its directions, and in obedience thereto fulfils its work. Each acts singly; each performs its own task. The eye sees, and the feet walk, and the hands handle; and, so far as regards the particular action of each, there is no direct connexion between them. It is just because there is a centre of union, to which each severally refers, that the functions of all are directed to some one definite end, and that an adequate result is achieved.