Bile, a yellow, bitter liquid, separated from the blood by the cells of the liver and collected by the biliary ducts, which unite to form the hepatic duct. Bile passes from this into the duodenum, or by the cystic duct into the gall bladder, to be retained there till required for use. The flow of bile is continuous, but the amount varies during the twenty-four hours, being most abundant during digestion. The use of the bile is to aid in the digestion of fatty substances and to convert the chyme into chyle. It probably retards or prevents the decaying of food and may stimulate muscular action in the intestines. When bile is not secreted in due quantity from the blood, the unhealthy condition known as biliousness results.