The year 1728 was marked by the reissue of the "Life and Adventures" as "The Supernatural Philosopher ... by William Bond," whose probable connection with the work has already been discussed, and by the publication in the "Craftsman"[10] of a letter, signed "Fidelia," describing a visit to Duncan Campbell. The writer, who professes an intense admiration for Mr. Caleb D'Anvers and all his works, relates how the dumb oracle, after writing down her name, had prophesied that the Craftsman would certainly gain his point in 1729. She concludes with praise of Mr. Campbell, and an offer to conduct Caleb to visit him on the ensuing Saturday. That the communication was not to be regarded as a companion-piece to the letter from Dulcibela Thankley in the "Spectator" (No. 474), was the purport of the editorial statement which introduced it: "I shall make no other Apology for the Vanity, which I may seem guilty of in publishing the following Letter, than assuring the Reader it is _genuine_, and that I do it in Complyance with the repeated Importunity of a _fair Correspondent_." The style of the letter does not strongly suggest that of "A Spy upon the Conjurer," though the concluding sentence, "_Love_ shall be there too, who waits forever upon _Wit_," is a sentiment after Eliza's heart. And moreover, though "Fidelia" and "Justicia" may be one and the same persons, Mr. D'Anvers' assurances that the letter is genuine are not to be relied upon with too much confidence, for had he wished to praise himself, he would naturally have resorted to some such device. The last volume relating to the Scotch wizard did not appear until 1732, two years after Campbell's death. "Secret Memoirs of the late Mr. Duncan Campbel, The famous Deaf and Dumb Gentleman. Written by Himself, who ordered they should be publish'd after his Decease," consisted of 164 pages devoted to miscellaneous anecdotes of the prophet, a reprint of Defoe's "Friendly Daemon" (p. 166), "Original Letters sent to Mr. Campbel by his Consulters" (p. 196), and "An Appendix, By Way of Vindication of Mr. Duncan Campbel, Against That groundless Aspersion cast upon him, That he but pretended to be Deaf and Dumb. By a Friend of the Deceased" (p. 225). The authorship of this book has received but slight attention from students of Defoe, and still remains something of a puzzle. No external evidence on the point has yet come to light, but some probable conclusions may be reached through an examination of the substance and style.