There will remain on the volume a very slight deposit of gelatine or gluten; before it dries completely, the palm of the hand may be passed over it at all points, and the leather, which may have assumed a dull color from the starch, will resume a bright brown or other tint. If this fails to appear, a bit of flannel, impregnated with a few drops of varnish, should be rubbed over the leather, and when nearly dry, rub with a white rag slightly touched with olive oil, and a brilliant appearance will be given to the binding. When leaves are started, or a signature becomes loose in any volume, it should be at once withdrawn from circulation, or the loss of an important part of the book may result. The remedy commonly resorted to, of patching up the book by pasting in the loose leaves, is a mere makeshift which will not last. The cause of a loose signature is generally to be found in a broken thread in the sewing, and the only permanent cure is to take the book out of its cover, and re-sew it, when it may usually be re-inserted in the same binding. This is for cloth-bound books. When bound in leather, it is best to take out the loose sheet, "overcast" it, that is, secure all the leaves by sewing, then carefully lay some paste along the outer edge or back of the sheet, insert the sheet in its place, pressing it firmly with a paper knife along the middle of the sheet, and the volume will be restored ready for use after a few days drying under weight. On occasion of a fire next to the Mercantile Library rooms in Philadelphia, in 1877, great damage was done, from water thrown by the fire-engines, to many thousands of books. The library authorities tried various methods of restoring the volumes, and among others, drying them in ovens was resorted to. This was found, however, to dry the books so rapidly, that the bindings cracked, and in many cases came off, while many volumes were much warped. The most advantageous method that was adopted was to prepare a large number of frames on which many wires were strung horizontally across a large room. The wet books (many of which were soaked through) were suspended on these wires in such a way as to dry them by degrees, the temperature of the room being raised considerably by furnace heat.