in the Jewish Encyclopedia:
Falk claimed to possess thaumaturgic powers and to be able to discover hidden treasure. Archenholz (*England und Italien*, I. 249) recounts certain marvels which he had seen performed by Falk in Brunswick and which he attributes to a special knowledge of chemistry. In Westphalia at one time Falk was sentenced to be burned as a sorcerer, but escaped to England. Here he was received with hospitality and rapidly gained fame as a Cabalist and worker of miracles. Many stories of his powers were current. He would cause a small taper to remain alight for weeks; an incantation would fill his cellar with coal; plate left with a pawnbroker would glide back into his house. When a fire threatened to destroy the Great Synagogue, he averted the disaster by writing four Hebrew letters on the pillars of the door.<sup></sup> [Obviously the Tetragrammaton.]
On his arrival in London in 1742 Falk appeared to be without means, but soon after he was seen to be in possession of considerable wealth, living in a comfortable house in Wellclose Square, where he had his private synagogue, whilst gold and silver plate adorned his table. His Journal, still preserved in the library of the United Synagogue, contains references to "mysterious journeyings" to and from Epping Forest, to meetings, a meeting-chamber in the forest, and chests of gold