Quacks, Who in Cool Blood Undertook to Overreach Mankind
Hitherto we have principally passed such persons in review, as seem to have been in part at least the victims of their own delusions. But beside these there has always been a numerous class of men, who, with minds perfectly disengaged and free, have applied themselves to concert the means of overreaching the simplicity, or baffling the penetration, of those who were merely spectators, and uninitiated in the mystery of the arts that were practised upon them. Such was no doubt the case with the speaking heads and statues, which were sometimes exhibited in the ancient oracles. Such was the case with certain optical delusions, which were practised on the unsuspecting, and were contrived to produce on them the effect of supernatural revelations. Such is the story of Bel and the Dragon in the book of Apocrypha, where the priests daily placed before the idol twelve measures of flour, and forty sheep, and six vessels of wine, pretending that the idol consumed all these provisions, when in fact they entered the temple by night, by a door under the altar, and removed them.