No edges contribute so greatly to the generally elegant appearance of a book as gilt-edges; they are lustrous and rich and are more pleasing to the eyes of most men than the plain and unseemly colored edges, though a great deal of trouble and industry is necessary to the production of these beautiful effects. A principal condition in the production of gilt-edges is the utmost cleanliness and skill in executing the necessary manipulations. In cutting the book, great care must be taken that the cuts are entirely smooth and clean, without any blemish. Sharp knifes are therefore indispensable in this kind of work. Gilt-edges demand an entirely smooth surface which is only produced by carefully scraping the surface with a steel scraper. The edge must be scraped perfectly smooth so as not to show the marks of the knife in cutting or those of the scraper. To this end the books, the edges of which have already been cut, are placed between gilding-boards in hand presses in such a way that the fore-edge protrudes but slightly over the cheeks of the press. After the press has been tightly drawn down and has been fastened firmly, the scraping of the edges can be begun. When this tiresome work has been finished, and an entirely smooth surface has been obtained, the surface is moistened with a paste-water and rubbed dry with clean paper-shavings. By this grinding and rubbing off, the edge becomes shiny and dry, and gains in the power of resistance, which is of great importance for the burnishing that occurs in the later stage of gilt-edging. The smooth, hard ground of paste is not sufficient for the production of gilt-edges that are perfectly beautiful. They must be colored lightly with bolus or chalk, (the most adapted to this work is the finely washed Armenian bole.) The book-binders supply establishment of Wm. Leo, of Stuttgart, provides an excellent article. This bole after it has been finely ground and scraped, must be mixed with a solution of albumen (the white of the egg) such as is used for laying on gold leaf, and must be spread lightly and evenly over the edge by a fine broad hair brush or with a fine sponge, to prohibit the scaling off of the gold. This process must be repeated. The ground of bole gives the gilt-edge a dark shade and a high lustre and glow. When the grounding of bole is entirely dry, and all the parts clinging to the edge have been carefully brushed off, we begin the most difficult part in the production of gilt-edges, the laying on of the gold. As binding medium between the gold-leaf and the edge of the book, a solution of the white of the egg is used. Carefully separate the white of the egg from the yolk and dilute the same with 1 pint of water and stir until a perfect mixture of the two results. After this fluid has stood for several hours, it becomes perfectly clear, the froth of the egg floating upon the surface is removed and the solution is ready for use. Paper containing lime makes a stronger size necessary.