_Psychology as related to the healing Art._--Scarcely less intimate is the connection of psychology with the science of life. The physician finds in the practice of his profession, that in order to success, the laws of the human mind must constitute an important part of his study--how to avoid, and how to touch, the secret springs of human action. A word rightly spoken is often better than a medicine. In order to comprehend the nature of disease he must understand the effect on the bodily organization of the due, and also of the undue, exertion of each of the mental faculties; in fine, the whole relation of the mind to the bodily functions, and its influence over them--a field of inquiry as yet but imperfectly understood, if indeed adequately appreciated by the medical profession. _As related to Oratory._--To the public speaker, whether at the bar, in the public assembly, in the halls of legislation, or in the pulpit, it need hardly be said that a knowledge of this science, and the ability to make practical use of it, is indispensable. Success in oratory depends, doubtless, in a measure, upon other things; but he who best understands the laws and operations of the human mind, how to touch the sensibilities, how to awaken the passions, how to excite the fears and the hopes, how to rouse the resentment of his hearers, how to soothe the troubled spirits, and allay the excitement of feeling, and disarm prejudice, and call into play the sober reason and calm judgment of man, will best be able to accomplish his purpose. He will be able to turn to his own account the circumstances of the occasion, and like a skillful organist, touch with ease, yet with precision and effect, what key he will. No man can do this who does not well understand the instrument. _As related to the Art of Education._--Especially is this science of use to the _teacher_ in the knowledge which it gives him of the mind of his pupil, and the skill in dealing with that mind. The mind of the pupil is to him the instrument on which he is required to play--a curious instrument of many and strange keys and stops--capable of being touched to wonderful harmony, and to fearful discord;--and to handle this instrument well is no ordinary acquirement. What shall we say of the man who knows nothing of the instrument, but only the music to be performed, nothing of the mind to be taught, but only the knowledge to be communicated? To know the mind that is to be taught, how to stimulate, how to control, how to encourage, how to restrain, how to guide and direct its every movement and impulse, is not this the very first and chief thing to be known?