really injures a performer. Exposure of the secrets of the fire-eaters, for instance, dates back almost to the beginning of the art itself. The priests were exposed, Richardson was exposed, Powell was exposed and so on down the line; but the business continued to prosper, the really clever performers drew quite fashionable audiences for a long time, and it was probably the demand for a higher form of entertainment, resulting from a refinement of the public taste, rather than the result of the many exposures, that finally relegated the Fire-eaters to the haunts of the proletariat.
How the early priests came into possession of these secrets does not appear, and if there were ever any records of this kind the Church would hardly allow them to become public. That they used practically the same system which has been adopted by all their followers is amply proved by the fact that after trial by ordeal had been abolished Albertus Magnus, in his work De Mirabilibus Mundi, at the end of his book De Secretis Mulierum, Amstelod, 1702, made public the underlying principles of heat-resistance; namely, the use of certain
