Ater succus; bilis alra; black bile. According to the ancients it arises, 1st, From the grosser parts of the blood, and this they called the melancholy humour. 2dly, From yellow bile being highly concocted. Dr. Percival in his Essays suggests, that it is the gall rendered acrid by stagnation in the gall bladder, and viscid by the absorption of its fluid parts. Bile in this state discharged into the duodenum, occasions universal disturbance until it is evacuated; violent vomiting, or purging, or both; and previously the pulse is quick, the head achs, a delirium, a hiccough, intense thirst, inward heat, and a fetid breath, come on. Some describe this kind of bile as being acid, harsh, corroding, and, when poured on the ground, bubbling up like a ferment. Dr. Percival says, that, by the use of the infus. sennae iimoniatum warmed with the tinctura columbae, he has checked the vomitings occasioned by this matter. In many instances this bile resembles blood, and has been considered as such. The distinction is easy when the matter is diluted, as the blood has a reddish, and the bile'a yellowish hue. See Melaema and Morbus niger.