Duct is known as the common bile duct, and runs down to the second part of the duodenum (see Alimentary Canal).
There is no gallbladder, and the biliary duct enters the duodenum about 6 in.
In this sense alone quinine is a tonic. The hydrochloric acid of the gastric juice is stated to convert any salt of quinine into a chloride, and it seems probable that the absorption of quinine takes place mainly from the stomach, for when the drug reaches the alkaline secretions of the duodenum it is precipitated, and probably none of it is thereafter absorbed.
The principal duct enters the duodenum with the bileduct, and there is often a second small duct opening separately.