Broadly speaking, and age apart, pottery may be divided into two classes: one in which glazing does not appear, and one in which this important element of ceramics lends an entirely different character to the product. The first class more especially, if not exclusively, may be grouped into two types according to character: those that interest the scientist in particular, and those that come more into the domain of the artist and art lover. It is of course understood that there is no definite line of demarcation between the two. Faking, however, with a great spirit of impartiality, makes no distinctions and is ready to meet its clients on the scientific or artistic field, and fully prepared to accommodate the scientist with an artistic bent or the artist possessing the learned propensities of the historian. Thus Mexican idols and Peruvian pottery, as well as the productions of savage tribes, are imitated and copied with the same interest as the unglazed vases of Samos, Greek clay urns and Roman lamps. What regulates the increase of the forger’s activities and spurs his genius is, as we have said, the demand for an article and its price. There is nothing surprising then in the fact that some rather indifferent types of pottery of savage tribes, or incomplete aboriginal specimens, should have been faked as though they presented the interest of a _chef-d’œuvre_. Not altogether of this class, but certainly of limited interest so far as art is concerned, are the Mexican articles which have been among the most exploited by those who know that these kinds of relics are in great demand by scientists as well as collectors who have a passion for specialities. In the Exhibition of 1878, a group of scientists put the incautious upon their guard by exhibiting a whole series of faked Mexican idols, pottery and so forth. But as the articles, especially at that time, were in great vogue, the warning was not sufficient for specialists and collectors, and the show of faked Mexican art proved such a success that it stirred the honesty or cynicism, we hardly know which, of a Parisian dealer who conceived the notion to advertise his wares: “Forgeries of Mexican idols, 5-25 francs.” Unglazed Oriental and Græco-Roman pottery, with its fine forms and decorative character, has not only proved an attraction to the collector but very tempting to the faker who finds no great difficulty in imitating it. The way to render such pottery antique-looking is easy. Acids may play their part here too, but they are hardly necessary as the porous nature of the clay makes it able to absorb any kind of hue, tone and dirt if buried in specially prepared ground or in a bed of fertilizer.