Dee and Kelly lived for some years in Poland and Bohemia in alternate wealth and poverty, according to the credulity or scepticism of those before whom they exhibited.
Much bibliographical and other information about the later writers on alchemy is contained in Bibliotheca Chemica (2 vols., Glasgow, 1906), a catalogue by John Ferguson of the books in the collection of James Young of Kelly (printed for private distribution).
After the fall of John Kelly he became the leader of Tammany Hall (q.v.), and for some time almost completely controlled the organization.
They professed to raise spirits by incantation; and Kelly dictated the utterances to Dee, who wrote them down and interpreted them.
Shortly afterwards Kelly and Dee were introduced by the earl of Leicester to a Polish nobleman, Albert Laski, palatine of Siradz, devoted to the same pursuits, who persuaded them to accompany him to his native country.
An account of his life, privately printed, was written by the Rev. John Kelly (1150-1809), the Manx scholar, who married one of his granddaughters.