_Sadler and Green._--The tiles to which I have alluded bring me to a very interesting part of the subject of this chapter. I mean the introduction of _printing_ on earthenware, an invention which has been attributed to, and claimed by, several places, and which will yet require further research to entirely determine. At Worcester it is believed the invention was applied in the year 1756, and it is an undoubted fact that the art was practised there in the following year, a dated example of the year 1757 being, happily, in existence.[2] At Caughley transfer-printing was, as I have already shown, practised at about the same period. At Battersea, printing on enamels was, it would seem, carried on at about the same date, or probably somewhat earlier. At Liverpool it is certain that the art was known at an earlier period than can with safety be ascribed to Worcester. A fine and exquisitely sharp specimen of transfer-printing on enamel, dated 1756, is in Mr. Mayer’s possession. It is curious that these two earliest dated exemplars of these two candidates for the honour of the invention of printing on enamels and earthenware, Liverpool and Worcester, should be portraits of the same individual--Frederick the Great of Prussia. But so it is. The Worcester example is a mug, bearing the royal portrait with trophies, &c., and the date 1757; the Liverpool one an oval enamel (and a much finer work of art), with the name, “J. SADDLER, Liverp^l. Enam^l.” The art is said to have been invented by this John Sadler, of Liverpool, in 1752. In Moss’s “Liverpool Guide,” published in 1790, it is stated:--“Copper-plate printing upon china and earthenware originated here in 1752, and remained some time a secret with the inventors, Messrs. Sadler and Green, the latter of whom still continues the business in Harrington Street. It appeared unaccountable how uneven surfaces could receive impressions from copper-plates. It could not, however, long remain undiscovered that the impression from the plate is first taken upon paper, and thence communicated to the ware after it is glazed. The manner in which this continues to be done here remains still unrivalled in perfection.”