It is the duty of the physician to get at these mental causes of physical ills and remove them by persuasion, by reassurance, by changing the mental attitude, by making people understand just how mind influences body, but this must be done tactfully. From the beginning of time we have written our prescriptions in such a way that ninety-nine out of one hundred patients have not been able to understand them. It has often been said that we should change this method of prescription writing, and write directions for the compounding of our medicines in plain vernacular. Besides the many {192} scientific reasons against this, it is better for patients not to know exactly the details of their treatment. Physicians, because of their real or supposed knowledge, are usually the worst patients. If, when a physician is ill, a drug is administered in which he has lost confidence, he will really oppose its action by contrary suggestion, and perhaps neutralize it. Confidence added to the action of the drug itself, makes it much more potent and much more direct. Hence the suggestive value of a prescription the ingredients of which are unknown. Every physician knows of patients who have declared that a drug has been tried on them without avail, when it has only been used in such small quantities as to be quite nugatory in its effect. Such use was enough to prejudice them against it so that when given in physiological doses it failed to work properly. Opium given to a trusting patient, in gradually reduced doses until practically there is nothing but the flavor of the drug in the compound that he takes, will continue to have its effect. But to a patient prejudiced against the drug, even large doses of opium will prove unavailing, because the lack of confidence disturbs the mind, directs attention to whatever discomfort may be present, emphasizes the ill and prevents sleep by preoccupying the mind with the thought that neither the drug nor the dose can accomplish its purpose. In a word, medicine plus mental influence is extremely valuable. Medicine minus mental influence is valuable but sometimes ineffective. Medicine, with mental influence opposed to it, is often without effect because of the strong power the mind has over bodily functions.