The paste is made very thin, thus:--Put a teaspoonful of arrowroot (not _heaped_) into a teacup with about two spoonfuls of cold water, and mix into a paste: then add _boiling_ water enough to fill the cup, and stir. Many photographers merely attach the _edges_ of their pictures, but I prefer them to adhere all over. Gum is fatal to the beauty of a photograph, unless it is previously re-sized. GEO. SHADBOLT. _Mr. Lyte's Collodion_ (Vol. ix., p. 225.).--Our readers may remember that in "N. & Q.," Feb. 18, MR. F. MAXWELL LYTE furnished our readers with a detailed plan of his mode of preparing collodion. In that article, written from Pau, that gentleman was so good as to promise us that when he had an opportunity he would send us a couple of specimens of his workmanship. He has more than fulfilled his promise, for we have received from him this week four photographs, which, for general beauty and minuteness of detail, cannot be surpassed. The subjects are, I. Study of Trees, No. 2.; II. Study of Trees, No. 5. Old Pollard Oak; III. Study of Trees, Peasants collecting Leaves; IV. Old Church Porch, Morlaas, Monogram of the Eleventh Century. MR. LYTE, who is a first-rate chemist, has shown himself by these specimens to be also a first-rate practical photographer. From him, therefore, the art may look for much future progress. * * * * * Replies to Minor Queries. _Burton's "Anatomy of Melancholy"_ (Vol. ix., p. 191.).--DR. RIMBAULT may perhaps be interested in hearing that some years ago I urged upon two London publishers the desirableness of bringing out a new edition of Burton's _Anatomy of Melancholy_, but they both declined to undertake the work. I then resolved to publish myself the _latter_ part of the work (on _Religious Melancholy_), and made known my intention in. "N. & Q.," in the hope of obtaining some casual notes and observations; but in this also I was disappointed. As, however, my intention is only suspended for the present, not abandoned, I shall be obliged by any assistance that DR. RIMBAULT, or any of your readers, can afford me. Can any one correct the following list of editions of the _Anatomy of Melancholy_? 1621. 4to. Oxford. 1624. fol. Oxford. 1628. fol. Oxford. 1632. fol. Oxford. 1638. fol. 1651-2. fol. 1660. fol. London. 1676. fol. 1728. fol. 1738. fol. 1800. fol. 2 vols. 1804. 8vo. 2 vols. 1806. 8vo. 2 vols. 1827. 8vo. 2 vols. 1829. 8vo. 2 vols. 1837. 8vo. 2 vols. 1839. 8vo. 1845. 8vo. If Watt's _Biblioth._ be correct, the _last_ folio edition was _not_ that of 1676 (see "N. & Q.," Vol. ix., p. 121.); but on this and other similar points I shall be glad to hear DR. RIMBAULT'S opinion. M. D.