Declining, therefore, all speculation as to what the varnish is or what it is not, or any nostrums for its re-discovery, we will pass on at once to the description of the different Italian varnishes, which may be divided into four distinct classes, viz., the Brescian, Cremonese, Neapolitan, and Venetian. These varnishes are quite separable in one particular, which is, the depth of their colouring; and yet three of them, the Brescian, Cremonese, and Venetian, have to all appearance a common basis. This agreement may be accounted for with some show of reason by the supposition that there must have been a depot in each city where the varnish was sold in an incomplete form, and that the depth of colour used, or even the means adopted for colouring, rested with the maker of the instrument. If we examine the Brescian varnish, we find an almost complete resemblance between the material of Gasparo da Salo and that of his coadjutors, the colouring only being different. Upon turning to the Cremonese, we find that Guarneri, Stradivari, Carlo Bergonzi, and a few others, used varnish having the same characteristics, but, again, different in shade; possibly the method of laying it upon the instrument was peculiar to each maker. Similar facts are observable in the Venetian specimens. The varnish of Naples, again, is of a totally different composition, and as it was chiefly in vogue after the Cremonese was lost, we may conclude that it was probably produced by the Neapolitan makers for their own need. If we reflect for a moment upon the extensive use which these makers made of the Cremonese varnish, it is reasonable to suppose that it was an ordinary commodity in their days, and that there was then no secret in the matter at all. To account for its sudden disappearance and total loss is, indeed, not easy. After 1760, or even at an earlier date, all trace of it is obliterated. The demand for it was certainly not so great as it had been, but quite sufficient to prevent the supply from dying out had it been possible. The problem of its sudden disappearance may, perhaps, be accounted for without overstepping the bounds of possibility, if we suppose that the varnish was composed of a particular gum quite common in those days, extensively used for other purposes besides the varnishing of Violins, and thereby caused to be a marketable article. Suddenly, we will suppose, the demand for its supply ceased, and the commercial world troubled no further about the matter. The natural consequence would be non-production. It is well known that there are numerous instances of commodities once in frequent supply and use, but now entirely obsolete and extinct.