WM. J. NEWTON. 6. Argyle Street. _Talc for Collodion Pictures._--Should any of your photographic friends wish to transmit collodion pictures through the post, I would suggest that thin plates of talc be used instead of glass for supporting the film; I find this substance well suited to the purpose. One of the many advantages of its use (though I fear not to be appreciated by your archæological and antiquarian section) is, that portraits, &c., taken upon talc can be cut to any shape with the greatest ease, shall I say suitable for a locket or brooch? W. P. Headingley, Leeds. * * * * * REPLIES TO MINOR QUERIES. _Portrait of the Duke of Gloucester_ (Vol. vii., p. 258.).--I beg to inform MR. WAY that he will find an engraving of "The most hopefull and highborn Prince, Henry Duke of Gloucester, who was borne at Oatlandes the eight of July, anno 1640: sould by Thos. Jenner at the South entry of the Exchange," in a very rare pamphlet, entitled: "The Trve Effigies of our most Illustrious Soveraigne Lord, King Charles, Queene Mary, with the rest of the Royall Progenie: also a Compendium or Abstract of their most famous Genealogies and Pedegrees expressed in Prose and Verse: with the Times and Places of their Births. Printed at London for John Sweeting, at the Signe of the Angell, in Pope's Head Alley, 1641, 4to." For Henry Duke of Gloucester, see p. 16.: "What doth Kingdomes happifie But a blesst Posteritie? This, this Realme, Earth's Goshen faire, Europe's Garden, makes most rare, Whose most royall Princely stemme (To adorne theire Diadem) Two sweet May-flowers did produce, Sprung from Rose and Flower-de-Luce." [Greek: Phi]. Richmond, Surrey. _Key to Dibdin's "Bibliomania_" (Vol. vii., p. 151.).--There are some inaccuracies in the list of names {339} furnished by W. P., which may be corrected on the best authority, namely, that of Dr. Dibdin himself, as put forth in his "new and improved edition" of the _Bibliomania_, with a supplement, "including a key to the assumed characters in the drama," 8vo., 1842. According to this supplement we are to interpret as follows: Alfonso Mr. Morell. Gonzalo Mr. Jessop. Narcottus William Templeman, Esq., of Hare Hatch, Berkshire. Nicas Mr. Shaclewell. Philemon Mr. Jacobs? Pontevallo John Dent, Esq. A complete "key" is not furnished; but there is reason, I think, to doubt a few of the other names in W. P.'s list. Moreover, in the edition of 1842, several other pseudonymes are introduced, which do not appear in the list; namely, that of Florizel, for Joseph Haslewood; Antigonus; Baptista; Camillo; Dion; Ferdinand; Gonsalvo; Marcus; and Philander; respecting whom some of your readers may possibly enlighten us further. As to the more obvious characters of Atticus, Prospero, &c., see the _Literary Reminiscences_, vol. i. p. 294. [Greek: Mu].