in the history of fossils, a name given by late late authors, to a substance called, in English, soap-earth. Dr Woodward much recommends it as a substance for making porcelain; and repeated trials of it have been made since his time, and some of them very lately; in all which it has afforded the finest earthen-ware ever made with us, and promises fair, with good management, for the equaling any in the world. It is dug in many parts of Devonshire and Cornwall, and the neighbouring counties; the cliff of the Lizard-point is almost wholly composed of it, and the adjacent little islands abound with it; and from all these places it might be brought, at a small expense, in any quantities. It is known from all other earths by these characters: it is composed of extremely fine particles; and is of a firm, equal and regular texture, and a great weight. It is very firm and hard as it lies in the earth, but when it has been some time exposed to the air, it becomes almost of a stony hardness. It is of a perfectly fine, smooth, and glossy surface, softer to the touch than any other species of earth, and does not at all adhere to the tongue, or stain the fingers in handling; but drawn along a rough surface, as a piece of cloth, or the like, it marks it with a fine and even white line. In colour it is a clear white, veined and variegated very beautifully with purple of different degrees of deepness; and is of so fine a structure of parts, that when cut into thin pieces, it is in some degree transparent. It makes no effervescence with acids, and burns to a pure white, even in its purple parts.