"The god gave this oracle to a blind soldier, named Valerius Aper, that he should mingle the blood of a white cock with honey, and make a collyrium, which he should put upon his eyes three days together. After which he saw, and came publicly to return thanks."[99:1]
Although usually regarded as a purely mythological being, Esculapius is believed by some writers to have been an historic personage. According to tradition, he transmitted his professional knowledge to his descendants, the Asclepiadæ, a priestly caste, versed in medical lore. For centuries the most famous Grecian physicians were members of this order; and the great Hippocrates, styled "the Father of Medicine," is said to have claimed to be the seventeenth in direct descent from Esculapius.[99:2] Although the god of healing may be said to have been also the first practising physician, his distinguished teacher Chiron, the wise Centaur, was without doubt the first medical professor whose name has been handed down. To Chiron is usually ascribed the honor of having introduced among the Grecians the art of Medicine, in the thirteenth century b. c. He was reputed to have been a learned chief or prince of Thessaly, who was also a pioneer among equestrians, one who preferred horseback as a means of locomotion, rather than the chariot, or other prototype of the chaise, buggy, automobile, or bicycle. Hence the superstition of that rude age gave him a place among the Centaurs. He is reported moreover to have imparted instruction to the Argonauts, and to the warriors who participated in the siege of Troy. From this hero is derived the name of the plant centaury, owing to a legend of its having been used with success as a healing application to a wound in Chiron's foot.
The worship of Esculapius, as the god of healing, was widespread among the Greeks, and lasted even into Christian times. Patients repaired to the temples, just as relief is sought to-day by a devotional pilgrimage, or by a resort to a sacred spring. The records of cures were inscribed upon the columns or walls of the temple, and thus is believed to have originated the custom of recording medical and surgical cases.[100:1]
The priests exerted a powerful influence upon the minds of applicants by reciting wonderful tales, as they led them through the sacred precincts, explaining in mystical language the miraculous cures which had been performed there, and calling attention to the numerous votive offerings and inscriptions upon the temple walls. It may readily be conceived, wrote Richard J. Dunglison, M.D.,[100:2] that these procedures made a deep impression upon the patients' minds, and the more so, because the priests were wont to dwell especially upon the cures which had been effected in analogous cases.
Moreover hydro-therapy was supplemented by massage, which often had beneficial results in nervous affections; and fumigation of the patients, before they received advice from the oracle, lent an air of mystery. Those who were cured returned to express their gratitude and to offer presents to the god, as well as to the priests. They usually also brought some ornament for the adornment of the temple.
The act of sleeping in a sanctuary, in order to obtain medical relief, either through revelations by dreams, or through a divine visitation, was termed incubation.
According to the philosophy of oneiromancy, or the art of taking omens from dreams, during sleep the soul was released from the body, and thus enabled to soar into spiritual regions and commune with celestial beings. Therefore memories of ideas suggested in dreams were cherished as divine revelations.[101:1]
The opinion has been advanced that the methods employed to procure "temple sleep" were similar to those in use at the present time for the production of the hypnotic state. A cure was effected by awakening a healing instinct in the patient's subconscious mind.[101:2]
So far as we are aware, no authentic rational explanation has been given of the phenomenal appearance of a god in the patient's presence. It seems plausible that Asklepios, the Grecian Esculapius, was personated by some priest of majestic mien, who gave oracular medical advice, which serves as a powerful therapeutic suggestion. Various attendant circumstances doubtless contributed to impress the patient's highly wrought imagination, such as the dim light, the sense of mystery, and, it may be, certain tricks of ventriloquism.