Page:Theophrastus - History of Stones - Hill (1774).djvu/332

 Genus. Species. Clays,

1. White Clay—Tobacco Pipe Clay of Pole.

2. Yellow Clay—Brewers Clay.

3. Brecon Clay—from Chedder Rocks.

4. Blue Clay—in the Cracks of Strata.

5. Green Clay—from Ochre Pits.

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

7. Black Clay—The Pnigites of Galen,