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Clays,

As they advance in Purity, aſſume the following Names and Characters.

1. White Clay—Tobacco Pipe Clay of Pole.

This takes in	blue Clay, and becomes,
	The Pipe Clay of Northampton.
	Spar, and becomes,
	The Paretonium of the Antients.

2. Yellow Clay—Brewers Clay.

This takes in	Chalk, and becomes,
	The Yellow Pot Earth of Stafdordſhire.
	Cryſtal, and becomes,
	Hedgerly Loam.
	White Sand, and becomes,
	Northamptonshire Pot Earth.
	Pale yellow Sand, and becomes,
	Common Loam, or Brick Earth,

3. Brecon Clay—from Chedder Rocks.

This takes in	a fine black Marle, and becomes,
	The Marbled Earth or Lemnos.
	Selenites, and becomes,
	Fine Tile Cray.
	Yellow Sand, and becomes,
	Founders Clay.

4. Blue Clay—in the Cracks of Strata.

This takes in	Marle, and becomes,
	The Coarse Pot Earth of Leiceſterſhire.
	Bole, and becomes,
	One of the China Earths.
	Yellow Sand, and becomes,
	Shropshire Pot Earth.
	Talc, and becomes,
	The Northampton Clay.

5. Green Clay—from Ochre Pits.

This takes in	Marle, and becomes,
	The Mendip Clay.
	Selenites, and becomes,
	The Dorset Clay.

6. Red Clay.—Mahogany Earth of the Iſle of Wight.

This takes in	Spar, and becomes,
	The Fine red Staffordshire Earth.
	Cryſtal, and becomes,
	The Pale Staffordshire Earth.

7. Black Clay—The Pnigites of Galen,

This takes in	White Clay, and becomes,
	The Sussex Pipe Clay.