We are told that Asclepiades of Bithynia, a famous Grecian physician of the second century B. C., who practised at Rome, systematically employed the "induced trance" in the treatment of certain affections. Probably he considered this method to conform with certain principles which he advocated. For he professed that a physician's duty consisted in healing his patients safely, speedily, and pleasantly; and as he met with considerable success, his system was naturally very popular. It seems certain that the physicians of old had no true conception of the psychological and physiological principles of healing by laying on of hands. It is probable, on the other hand, that they used this method in a haphazard way, relying largely on the confidence of their patients and the expectation of cure.[75:1] Tacitus, in his "History," book IV, chapter 81, relates that at the instance of the God Serapis, a citizen of Alexandria, who had a maimed hand, entreated that he might be pressed by the foot and sole of Vespasian (A. D. 9-79). The Emperor at first ridiculed the request, and treated it with disdain. However, upon learning the opinion of physicians that a cure might be effected through the application of a healing power, and that it was the pleasure of the gods that he should be the one to make the attempt, Vespasian, with a cheerful countenance, did what was required of him, while the multitude that stood by awaited the event in all the confidence of anticipated success. Immediately, wrote the historian, the functions of the affected hand were restored. The priests and magi of the ancient Druids possessed a wonderful faculty of healing. They were able to hypnotize their patients by the waving of a wand, and while under the spell of this procedure, the latter could tell what was happening afar off, being vested with the power of clairvoyance. But the Druidic priests also effected cures by stroking with the hand, and this method was thought to be of special efficacy in rheumatic affections. They also employed other remedies which appealed to the imagination, such as various mesmeric charms and incantations.[76:1] John Timbs remarks in "Doctors and Patients," that any person who claimed to possess the special gift of healing, was expected to demonstrate his ability by means of the touch; for this was the established method of testing the genuineness of any assumed or pretended curative powers. Among Eastern nations at the present time, European physicians are popularly credited with the faculty of healing by manual stroking or passes, and the same ideas prevail in remote communities of Great Britain. In the opinion of the author above mentioned, the belief in the transmission of remedial virtues by the hands is derived from the fact that these members are the usual agents in the bestowal of material benefits, as, for example, in almsgiving to the poor.