I have mentioned that the serpent was often exhibited by request; he was not completely visible, but the tail and body were exposed, while the head was concealed under the prophet’s dress. By way of impressing the people still more, he announced that he would induce the God to speak, and give his responses without an intermediary. His simple device to this end was a tube of cranes’ windpipes, which he passed, with due regard to its matching, through the artificial head, and, having an assistant speaking into the end outside, whose voicé issued through the linen Asclepius, thus answered questions. These oracles were called autophones, and were not vouchsafed casually to any one, but reserved for officials, the rich, and the lavish.