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 powkll] TECHNOLOGY, OR THE SCIENCE OF INDUSTRIES 34*

persons who engage in the fifth grade of arts, as we have desig- nated them, namely, esthetics, industries, institutions, linguistics, and opinions. In medicine, the professional medical man is remunerated, not for the medicine which he furnishes, but for the opinion which he gives.

Thus, in the order of arts which depend upon the properties, the fifth property of consciousness gives rise to a fifth industry of welfare, which we call medicine.

The subject of medicine is fundamentally controlled by the five properties of human bodies and the organs which are de- veloped severally for these properties. These are (i) the organs of metabolism or animal chemistry ; (2) the organs of circulation or animal construction ; (3) the organs of activity or animal loco- motion ; (4) the organs of hereditary genesis or reproduction, and (5) the organs of the mind or the nervous system. In order that the opinions of the medical man shall be of value, he must acquire a knowledge of the metabolic, constructive, muscular, reproductive, and nervous systems of the human body. This is fundamental.

Here it may be well to call attention to the organs of circula- tion in order to show that they are organs of construction, though motion is involved therein ; for the properties are always concom- itant. But when we consider circulation, we are considering it as the placement of the erythrocytes which are brought to the parts where they enter into construction. We are not considering the power by which circulation is accomplished, nor are we consider- ing the motion of the particles as trajectories, but we are consid- ering the constructive result which arises therefrom, together with the result which is produced in removing waste material. We are not considering how the removal is accomplished, but the results of the accomplishment.

For the sanitary knowledge which he must obtain, the med- ical man must acquire a knowledge of the substances which men use in continuing life on this planet — air, water, rocks, plants,

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