The task of identifying unknown ex-libris of the seventeenth and eighteenth centuries, those which bear a simple coat-of-arms without name of owner, or of artist or engraver, requires some patience, a collection of books of reference, and a knowledge of at least the rudiments of heraldry. The collector will soon learn to distinguish early French woodcuts from German, one marked difference being that nearly all German work was cut in relief, whilst French artists worked in the hollow, thus producing an engraving which feels rough where the ink lies. The crests on German plates are also very unlike those used in France; indeed, crests are comparatively rare on French book-plates, whilst the Germans frequently introduce several on one achievement; another very distinctive feature being the two large proboscis, or pipe-like horns, rising from the sides of the helmet, the _Chalumeaux_, of such constant occurrence in German crest heraldry, but rarely, if ever, found on a purely French ex-libris. A typical example of this peculiar ornament will be found on the ex-libris of _Hieronimus Ebner_, of Nuremberg, dated 1516, which is attributed to Albert Dürer; this is reproduced by M. Henri Bouchot, page 25. Another example of this ornament will be seen on the Alsatian plate of Le R. Père Ingold de l’Hay. The mode of engraving the armorial tinctures and bearings will probably show, as we have seen, whether the plate is earlier or later than 1639. Should the plate carry the name of artist or engraver, the date may be arrived at approximately by reference to the list of Artists and Engravers. Or, assuming that the plate has neither the name of the owner nor that of the artist, it may carry a motto, in which case several works may be consulted for information. One of the most modern is “Le Dictionnaire des Devises,” by Alphonse Chassant, which contains an enormous number of war cries, mottoes, and devices, adopted by distinguished families, not only in France, but in other nations. For readiness of reference these are arranged in alphabetical order, according to the first word of the sentence. Another useful reference book is “Historic Devices, Badges, and War Cries,” by Mrs. Bury Palliser (London: Sampson Low, Son, and Marston, 1870). This contains not only war cries and mottoes, but illustrations of some hundreds of family badges and devices, which are of great assistance in deciding the ownership of foreign nameless plates.