LYMPH

though quite as important as blood, is but little known to the public, probably becauso it is colourle . The fluid part of the aa g containing much nourishment, loaks through the walls of the finer blood-ve els and bathes the surrounding ti ues, which it nourishes. This escaped fluid is “ lymph.” The exce of lymph is collected into lymphatic veszels, which ramify pa bie ab and converge on larger ve els that finally unite to form the right or left thoracic duct. The thoracic ducts open into the subclavian vein, of their own side, at tho root of the neck. The escape of blood from the vein backwards into the Me ge is Vs ope by valves. Filters are situated at frequent intervals along the course of the lymphatic ve els in order to purify the lymph from germs, etc. The filter a are termed “lymphatic glands.” Obstruction to the circulation canses swelling due to the accumulation of lymph, and due to the same causo ia dropsy in the abdomen or chest. The fluid contained in a blister islymph. Hence lymph, in the public mind, means material! for vaccination, because the contents of s vaccination blister are used for the purpose. [s. 384]