“Having given this sketch of the natural history of the materials, ’tis needless to say much about the composition. Pottery being at present in great perfection in England, our potters’-mills prepare the Petunse much better than stamping mills, and excuse one from the trouble of washing it off, it being fit to be used as it comes from the mill. I would further observe that the mills should be made of the Petunse granite, it being obvious that, in grinding, some of the mill-stones must wear off and mix with the Petunse. If those stones should be of a nature disagreeable to the body, this mixture must, in some degree, be hurtful to it; whereas, whatever wears off from mill-stones of the same stone, cannot be so in the least degree. I have generally mixed about equal parts of the washed Caulin and Petunse for the composition of the body, which, when burnt, is very white, and sufficiently transparent. The Caulin of St. Stephen’s burns to a degree of transparency without the addition of Petunse. The materials from this place make a body much whiter than the Asiatic, and, I think, full as white as the ancient chinaware, or that of Dresden. “The stones I have hitherto used for glazing are those with the green spots of Tregonnin Hill. These, barely ground fine, make a good glaze. If ’tis wanted softer, vitrescent materials must be added. The best I have tried are those said to be used by the Chinese, viz., lime and fern-ashes, prepared as follows:--The lime is to be slacked by water, and sifted. One part of this, by measure, is to be mixed with twice its quantity of fern-ashes, and calcined together in an iron pot, the fire to be raised till the matter is red hot. It should not melt, and for that reason should be kept continually stirred. When it sinks in the pot, and grows of a light ash colour, ’tis done. It then must be levigated in the potter’s mill to perfect smoothness. It may be used in proportion of one part to ten, and so on to fifteen or twenty of the stone, as shall be found necessary. We found one to fifteen of the stone a very suitable proportion. Our manner of mixing was to dilute both the stones and the ashes to a proper degree for dipping, and then to mix them as above. On mixing, the whole grows thicker. If ’tis too thick for dipping, more water must be added. Our method of dipping was just the same as is used by the delft-ware people. We first baked our ware to a soft biscuit, which would suck, then painted it with blue, and dipped them with the same ease; and the glazing grows hard and dry, as soon as it does in the delft-ware. Large vessels may be dipped raw, as the Chinese are said to do it. But the proper thickness of the glaze is not so easily distinguished this way, as when the ware is biscuited; for, the raw body being of the same colour and consistence with the glaze, when the