See ARDEA, ORNITHOLOGY Index.

BITTERN in the salt works, the brine remaining after the salt is concreted: this they ladle off, that the salt may be taken out of the pan, and afterwards put in again; when, being farther boiled, it yields more salt. See SALT.

BITUMENS, in Natural History, are oily matters, of a strong smell, and of different consistencies, which are found in many places within the earth. See CHEMISTRY and MINERALOGY.