the polishing or crusting over earthen ware, by running melted lead or litharge over it.

The common ware is glazed with a composition of 50 lb. clean sand, 70 lb. lead-ashes, 30 lb. wood-ashes, and 12 lb. salt, all melted into a cake. With this mixture they glaze it over, and then set it in an earthen glazing pan; taking care that the vessels do not touch one another. As several colours are used for this purpose, we shall give the following receipts, from Smith's laboratory.

1. For a black, take lead-ashes, 18 parts; iron-fillings, 3; copper-ashes, 3; and zaffer, 2: this, when melted, will make a brown black; and if you would have it blacker, put some more zaffer to it.

2. For blue, take lead-ashes, 1 lb. clear sand or pebble, 2 lb. salt, 2 lb. white calcined tartar, 1 lb. Venice or other glass, 16 lb., and zaffer, half a pound: mix them well together; and after melting, quench them in water, and then melt them again; which operation is to be repeated several times; and if you would have it fine and good, it will be proper to put the mixture into a glass furnace for a day or two.

3. A brown glazing may be given with a mixture of lead-glass, 12 parts, and common glass and manganese, of each one part.

4. A citron yellow may be made of 6 parts of red-lead, 7 parts of fine red brick-dust, and 2 parts of antimony, all melted together.

5. A flesh-colour, with 12 parts of lead-ashes, and one of white glass.

6. For a green-colour, take 8 parts of litharge, 8 parts of Venice-glass, 4 parts of brass-dust, and melt them together for use; or melt together two parts yellow glass, with as much copper-dust.

7. For a gold-yellow, take antimony, red lead, and sand, an equal quantity, and melt them into a cake.

8. For a fine purple brown, take lead-ashes, 15 parts; clear sand, 18; manganese, 1; white glass, 15 measures; and 1 of zaffer.

9. For a fine red, take antimony, 2 lb. litharge, 3 lb. rust of iron calcined, 1 lb. and grind them to a fine powder.

10. For a fine white glazing, take 2 lb. of lead, 1 lb. of tin, and calcine them to ashes; of which take 2 parts; of calcined flint or pebble, 1 part; of salt, 1 part; and mixing them well together, melt them into a cake. At Rotterdam, they make a fine shining white glazing, by melting together 2 lb. clean tin-ashes, 10 lb. lead ashes, 2 lb. fine Venice-glass, and ½ lb. tartar.

11. A yellow glazing is made of 4 ounces of red lead, and 2 ounces of antimony, melted together.

12. For a fine yellow, take red lead, 3 pints; antimony and tin, of each 2 lb., then melting them into a cake, grind it fine; and repeating this several times, you will have a good yellow.