Tonic
in medicine, any remedy which improves the tone or vigor of the fibers of the stomach and b bowels, or of the muscular fibers generally. Tonics may be said to be of two kinds, medical and non-medical. Medical tonics act chiefly TONNAGE various areas in this region. The main feature of the country is the Sang-koi or Red river (variously spelt Sang-koi, Sang-coi, etc), coming from Yunnan, and traversing the whole of Tonking lengthwise, with a large delta. The chief produce is rice, silk, sugar, pepper, oil, cotton, tobacco, and fruits, with some copper and iron; and companies are now working coal and antimony mines at one or two places on the coast, especially near the chief port of Haiphong. Products valued at $10,000,000 annually. The French scheme of tapping the resources of Yunnan by means of the Song-koi has proved impracticable, the navigation of the upper course being very difficult.