BOCAR, or BOGHAR, a city of Tartary, in the country of the Uzbeks, near Gibun and Bikunt.

BOLES are viscid earths, less coherent and more friable than clay, more readily uniting with water, and more freely subsiding from it. They are soft and unctuous to the touch, adhere to the tongue, and by degrees melt in the mouth, impressing a light sense of astringency. There are a great variety of these earths, the principal of which are the following.

1. Armenian bole, when pure, is of a bright red colour, with a tinge of yellow: It is one of the hardest and most compact of the bodies of this class, and not smooth and glossy like the others, but generally of a rough dusty surface. It does not effervesc with acids.

2. French bole is of a pale red colour, variegated with irregular specks of white and yellow. It is much softer than the Armenian, and slightly effervesces with acids.

3. Bole of Blois is yellow, remarkably lighter than the most of the other yellow earths, and effervesces strongly with acids.

4. Bohemian bole is of a yellow colour, with a cast of red, and generally of a flaky texture. It is not acted on by acids.

5. Lemnian earth is of a pale red colour, and slightly effervesces with acids.

6. Silevan bole is of a brownish yellow colour, and acids have no sensible effects upon it.

These and other earths, made into little masses, and stamped with certain impressions, are called terra sigillata. These earths have been recommended as astringent, sudorific, and alexipharmic. But these, and many other virtues that have been ascribed to them, appear to have no foundation. They are still used in fluxes and complaints of the first palliages.