To trace the process of the manufacture, from the mixing of the ingredients to the burning of the last wash in the decorated piece, is very interesting. It is a process freely shown to visitors, and forms one of the principal lions in the sober old town which has lain for so many centuries on the banks of the Severn. The materials are brought from all parts of the world. Kaolin, or china clay, which is the felspar of decomposed granite washed from the rocks, is brought from Cornwall, so is the Cornish or china stone; felspar is brought from Sweden, and though of a rich red, it turns white when burnt; marl and fire-clay come from Broseley, in Shropshire, and Stourbridge; flints are brought from Dieppe; and bones--those of the ox only--come all the way from South America to be calcined and ground down. The grinding is a slow matter; each ingredient is ground separately in a vat, the bottom of which is a hard stone, whereon other hard stones of great weight revolve slowly. From twelve hours' to ten days' constant treatment by these remorseless mills is required by the various materials, some needing to be ground much longer than others before the requisite fineness is attained. It is essential that all the ingredients should be reduced to a certain standard of grain; and the contents of each vat must pass through a lawn sieve with four thousand meshes to the square inch. When the materials are sufficiently ground to meet this test, they are taken to the 'slip-house,' and mixed together with the clays, which do not need grinding. A magnet of great strength is in each mixing trough, and draws to itself every particle of iron, which, if allowed to remain in the mixture, would injure the ware very much. When properly mixed, the water is pressed out, and the paste or clay is beaten so that it may obtain consistency. Then it is ready to be made into the many shapes which find popular favour.