On some books, money has been lavished on the binding to an amount exceeding by many fold the cost of the book itself. Elegant book-binding has come to be reckoned as a fine art, and why should not "the art preservative of all other arts"--printing--be preserved in permanent and sumptuous, if not splendid style, in its environment? Specimens of French artistic binding from the library of Grolier, that celebrated and munificent patron of art, who died in 1565, have passed through the hands of many eager connoisseurs, always at advancing prices. The Grolier binding was notable for the elegant finish of its interlaced ornaments in gold-leaf, a delicacy of touch, and an inimitable flowing grace, which modern binders have struggled after in vain. At the Beckford Library sale in London, in 1884, there was a great array of fine French bindings of early date. A book from Grolier's library, the "Toison d'Or," 1563, brought L405, or over $2,000, and a Heptameron, which had belonged to Louis XIV, in beautiful brown morocco, with crown, fleur-de-lys, a stag, a cock, and stars, as ornaments, all exquisitely worked in gold, lined with vellum, was sold for L400. Following the Grolier patterns, came another highly decorative style, by the French binders, which was notable for the very delicate gold tooling, covering the whole sides of the book with exquisite scroll-work, and branches of laurel. The most celebrated of English book-binders was Roger Payne, who was notable for the careful labor bestowed on the forwarding and finishing of his books, specimens of which are still reckoned among the _chefs-d'oeuvre_ of the art. His favorite style was a roughly-grained red morocco, always full-bound, and he kept in view what many binders forget, that the leather is the main thing in a finely executed binding, not to be overlaid by too much gilding and decoration. He charged twelve guineas each (over $60) for binding some small volumes in his best style. Payne's most notable successors have been Lewis, Hayday, Bedford, and Zaehnsdorf, the latter of whom is the author of a treatise on book-binding. At the art exhibition of 1862, a book bound by Bedford was exhibited, which took two months merely to finish, and the binding cost forty guineas; and a Dore's Dante, exquisitely bound by Zaehnsdorf, in Grolier style, cost one hundred guineas. A decorative treatment not yet mentioned is applied to the covers of some books, which are bound in elegant full calf. To give to this leather the elegant finish known as "tree-calf binding", it is first washed with glaire or albumen. The boards of the book are then bent to a convex shape, and water sprinkled over, until it runs down from the centre in many little branches or rivulets. While running, a solution of copperas is sprinkled on, and carried along the branches which radiate from the central trunk, producing the dark-mottled colored effect which resembles, more or less nearly, a tree with its spreading branches.