Some of the phases of indeliberate psychotherapy, however, are even more interesting than this chapter of the history of genuine and deliberate psycho-therapeutics. Not a few of the remedies recommended, even by distinguished physicians, were utterly inert, yet accomplished good through their effect upon the patient's mind. If we were to omit all reference to certain favorite prescriptions that passed down from generation to generation, sometimes for centuries, yet eventually proved to be quite inefficient for the purpose for which they were employed, what a large lacuna would be left in the history of medical treatment! Galen's _theriac_ is a typical example of this. Still more strikingly the role of psychotherapy is seen in the many remedies that were recommended at various times for such self-limited diseases as erysipelas, ordinary coughs and colds, pneumonia and typhoid fever. Anything that was administered just before the change for the better came in these diseases, or that was persistently taken until that change came, was proclaimed as curative. An even more interesting chapter in the positive history of psychotherapy is that which shows how the value of genuine remedies was exaggerated by suggestion, and how these remedies became therapeutic fads, and sometimes almost seemed to be cure-alls. What a large place antimony holds in medical history, though it is now entirely discredited! How beneficent has venesection seemed, though it is now frankly confessed that it has but a narrow usefulness for a very circumscribed set of ills! Calomel in large doses has a history very like that of antimony. Alcohol in various forms, now so strikingly losing its hold in therapeutics, must also be placed in this category. Psychotherapy has perhaps had its most fruitful field of potency in connection with discoveries in the physical sciences. Whenever a discovery has been made in any science, an application of it to medicine has been mooted by some fertile mind, though as a rule it eventually proved to have no place in medicine. One might ordinarily expect that the suggestion would be latent only when the discovery was in one of the sciences allied to medicine, but this relation has not been necessary. Discoveries in astronomy even, in light, in electricity, in every department of physical science, have each been given their opportunity to affect patients' minds favorably, and have succeeded.