_Study of the Individual_.--The great differences in the relations between physicians and their patients is well recognized. To some physicians a patient will present only conventional symptoms, while a follow practitioner will discover the elements of an interesting case. Above all, the painstaking physician, interested in psychology, will find mental and other personal manifestations in his patient that distinctly modify the course of the disease. We must know all that is possible about the patient's attitude of mind toward his malady, and all the ideas that he has acquired with regard to it, either from previous relations with physicians or from what he may have read or heard from others. The removal of many false notions that are thus working harm will reward the medical practitioner who gets at his patient's ideas. The old rule in therapeutics is _non nocere_--to be sure to do no harm. The special rule in psychotherapy is to be sure to remove all the ideas that are doing harm to the patient and making his symptoms mean more to him than they really signify. _Neutralizing Contrary Suggestion_.--In the application of psychotherapy, then, the first principle is the neutralization of unfavorable mental influence. In our day men have such a smattering of knowledge about disease, especially about the worst forms of it, that they are likely to be in a frame of mind with regard to many affections that is quite unfavorable. Many patients think disease and not health. Disease means discomfort, and consequent loss of vital energy and disturbance of the resistive vitality that would enable the patient to throw off the affection. Sometimes the physician does not realize what a large part unfavorable suggestions are playing in the affection. Sometimes patients conceal their state of mind lest the doctor should confirm their worst fears. The preliminary to all successful treatment is to remove unfavorable suggestion. Favorable Suggestion.--The next thing is to set certain favorable suggestions at work. It is possible always to do this. Even in certain of the acute diseases favorable suggestion has its place, and for all chronic cases this form of therapeutics is extremely important. The very presence of the physician, especially if he is thoroughly in control of himself, placid, imperturbed, evidently ready to use all his powers without any excitement, is of itself the strongest kind of favorable suggestion. From the very beginning of medical history the presence of the physician has in most cases meant even more than his medicines. Muensterberg, in his recent book on Psychotherapy, has emphasized this in a way that deserves to be recalled: