14. And having placed a skull on the earth, they make it speak in this fashion. It is made out of the omentum of [Sidenote: p. 112.] an ox,[155] moulded with Tyrrhenian wax and gypsum and when it is made and covered with the membrane, it shows the semblance of a skull. The which seems to speak by the use of the implement and in the way we have before explained in the case of the boys. Having prepared the wind-pipe of a crane or some such long-necked bird and putting it secretly into the skull, the accomplice speaks what (the magician) wishes. And when he wants it to vanish, he appears to offer incense and putting round it a quantity of coals the wax receiving the heat of which melts, and thus the skull is thought to have become invisible.[156] 15. These and ten thousand such are the works of the magicians, which, by the suitableness of the verses and of the belief-inspiring acts performed, beguile the fancy of the thoughtless. The heresiarchs struck with the arts of these (magicians) imitate them, handing down some of their doctrines in secrecy and darkness, but paraphrasing others as if they were their own. Thanks to this, as we wish to remind the public, we have been the more anxious to leave behind us no place for those who wish to go astray. But we have been led away not without reason into certain secrets of the magicians which were not [Sidenote: p. 113.] altogether necessary for the subject,[157] but which were thought useful as a safeguard against the rascally and inconsistent art of the magicians. Since, now, as far as one can guess,[158] we have set forth the opinions of all, having bestowed much care on making it clear that the things which the heresiarchs have introduced into religion as new are vain and spurious, and probably are not even among themselves thought worthy of discussion, it seems proper to us to recall briefly and summarily what has been before said. 5. _Recapitulation._