The elusive name of Leacock is to be considered also in connection with an opera entitled, "The Disappointment; or, The Force of Credulity," signed by Andrew Barton,[3] supposed to be a pseudonym, and attributed variously to "Colonel" Thomas Forrest and to John Leacock. I already have had occasion to mention "The Disappointment" in connection with Godfrey's "The Prince of Parthia." The reader will remember that in 1767 "The Disappointment" was put into rehearsal, but was suddenly withdrawn in preference to Godfrey's piece. This play has been fully and interestingly analyzed by O. G. Sonneck, who gives the reasons for the withdrawal of the play from rehearsal by the American Company of Philadelphia, 1767. These reasons are definitely stated in the _Pennsylvania Gazette_ for April 16, 1767, which contains this warning in the American Company's advertisement of "The Mourning Bride": "N.B. 'The Disappointment' (that was advertised for Monday), as it contains personal Reflections, is unfit for the Stage." The reason why this piece is attributed to "Colonel" Thomas Forrest is that there is a memorandum in substantiation on the title-page of a copy owned by the Library Company of Philadelphia. Mr. Sonneck gives further and more extensive treatment of the subject in his excellent book on "Early Opera in America," (Schirmer, 1915) as well as in "Sammelbaende der Internationale Musik Gesellschaft," for 1914-1915. We mention the matter here, because, although Sonneck enters into a long discussion of the life of Forrest, he fails to give any satisfactory account of John Leacock. In fact, he says in closing, "If Andrew Barton, Esq., is to be a pseudonym, it seems to me that John Leacock, claimed (by Mr. Hildeburn) to have written the tragi-comedy of 'The Fall of British Tyranny,' should not be cast aside so cheerfully in favour of Thomas Forrest." Seilhamer and Durang, referring to the matter, mention Joseph Leacock as a claimant for the authorship of "The Disappointment," and say that he was a jeweler and a silversmith in Philadelphia; they also mention John Leacock, the Coroner. Durang, in the "History of the Philadelphia Stage," throws all weight in favour of Thomas Forrest. Sonneck says further, regarding the matter,--"We may dispose of Joseph by saying that he seems to have been among the dead when, in 1796, the second edition of 'The Disappointment,' revised and corrected by the author, was issued. On the other hand, Coroner John Leacock figures in the Philadelphia Directories even later."