The mind is a subjective as well as an objective index which reveals the bias which rules the whole case. Rarely do we see a mental exaltation or depression coupled with an opposite physical state, but when we do its remarkableness points the indication. The relative activity of the intellect combined with its moral trend is an invaluable aid and should always if possible be ascertained.
A study of the mental symptoms should include the gross objective changes noted by the attendants as well as a close scrutiny and interpretation of the speech, action and countenance by the physician, for the mind mirrors itself with great accuracy in the different modes and manners of physical expression. An intonation of the voice may sometimes explain the source and meaning of a particular symptom, so intricate are the mental processes. It is to be remembered that changes in the ordinary moods are points of departure whose value depends upon their variation from the normal or everyday condition.