If the colours of the _Tattwas_ and their nature were studied, a new field for medical science would open. It would become possible to explain why a raving maniac kept in a room of blue light will become quieted, and a melancholy person improve in a room filled with red or yellow rags; why a steer will become excited at the sight of red, and a mob infuriated by the sight of blood. Where the laws in consequence of which certain effects occur are unknown, we can only register the facts. If we recognise a truth by experience we can make use of it, leaving it to sceptical science to arrive at its recognition by hobbling along on its crutches of external observation and inference. These inferences are often drawn from wrong premises; effects mistaken for causes; drugs administered where the sources of the diseases exist in moral and mental conditions upon which drugs have no effect, etc., etc. The application of specific remedies therefore requires not merely a knowledge that this or that remedy has effected such and such cures, but also a knowledge of the circumstances in which it will produce such effects again. The real _Arcanum_ is the understanding of the relation existing between cause and effect. To those shortsighted practitioners who behold in every disease nothing but the manifestation of a purely physical or chemical cause, and to whom “mind,” “soul” and “spirit” are terms without meaning or merely physiological functions of unconscious matter, the _Arcana_ of such cures will ever remain unknowable mysteries; for they can be known only to those who understand the organization of the inner nature of man. The phenomena caused by life are incomprehensible as long as life is regarded as a product of forms without life; but he who is able to see in every living thing a manifestation of the _One Life_ pervading all nature, a function of universal will, has already entered the precincts of that higher science, which cannot be explained by words, if it is not known to the heart. III.—CHARACTERALES. A physician of this class is the one whose very presence inspires the patient with confidence in recovery. Consciously or unconsciously such a physician acts upon the two great motive powers in the constitution of the patient, namely his will and his imagination. He who can restore tranquillity of the soul by creating confidence, creates the condition required for the cure of the disturbance of the elements producing discord.