It is difficult to imagine the accessories used to produce the mental excitation in which alone such a presentment of evil could become imaginable. Fancy and legend, which have combined to represent as possible appearances of the supernatural, agree also in considering them as more likely to occur at certain times and places than at others; and it is possible that the missing pages of the diary contained an account of the time, place, and other conditions chosen by Temple for some deadly experiment. Sir John most probably re-enacted the scene under precisely similar conditions, and the effect on his overwrought imagination was so vivid as to upset the balance of his mind. The time chosen was no doubt the night of the 23d of October, and I cannot help thinking that the place was one of those evil-looking and ruinous sea-rooms which had so terrifying an effect on Miss Maltravers. Temple may have used on that night one of the medieval incantations, or possibly the more ancient invocation of the Isiac rite with which a man of his knowledge and proclivities would certainly be familiar. The accessories of either are sufficiently hideous to weaken the mind by terror, and so prepare it for a belief in some frightful apparition. But whatever was done, I feel sure that the music of the _Gagliarda_ formed part of the ceremonial. Medieval philosophers and theologians held that evil is in its essence so horrible that the human mind, if it could realise it, must perish at its contemplation. Such realisation was by mercy ordinarily withheld, but its possibility was hinted in the legend of the _Visio malefica_. The _Visio Beatifica_ was, as is well known, that vision of the Deity or realisation of the perfect Good which was to form the happiness of heaven, and the reward of the sanctified in the next world. Tradition says that this vision was accorded also to some specially elect spirits even in this life, as to Enoch, Elijah, Stephen, and Jerome. But there was a converse to the Beatific Vision in the _Visio malefica_, or presentation of absolute Evil, which was to be the chief torture of the damned, and which, like the Beatific Vision, had been made visible in life to certain desperate men. It visited Esau, as was said, when he found no place for repentance, and Judas, whom it drove to suicide. Cain saw it when he murdered his brother, and legend relates that in his case, and in that of others, it left a physical brand to be borne by the body to the grave. It was supposed that the Malefic Vision, besides being thus spontaneously presented to typically abandoned men, had actually been purposely called up by some few great adepts, and used by them to blast their enemies. But to do so was considered equivalent to a conscious surrender to the powers of evil, as the vision once seen took away all hope of final salvation.