Falk, Caїn Chenul. A Kabbalistic Jew, reputed to have worked “miracles”. Kenneth Mackenzie quotes in regard to him from the German annalist Archenoiz’ work on England (1788) :—“ There exists in London an extraordinary man who for thirty years has been celebrated in Kabbalistic records. He is named Caїn Chenul Falk. A certain Count de Rautzow, lately dead in the service of France, with the rank of Field-Marshal, certifies that he has seen this Falk in Brunswick, and that evocations of spirits took place in the presence of credible witnesses.” These “spirits” were Elementals, whom Falk brought into view by the conjurations used by every Kabbalist. His son, Johann Friedrich Falk, likewise a Jew, was also a Kabbalist of repute, and was once the head of a Kabbalistic college in London. His occupation was that of a jeweller and appraiser of diamonds, and he was a wealthy man. To this day the mystic writings and rare Kabbalistic works bequeathed by him to a trustee may be perused in a certain half-public library in London, by every genuine student of Occultism. Falk’s own writings are all still in MS., and some in cypher.
Source: H.P.Blavatsky - The Theosophical Glossary