Thymol. In large doses (10 to 30 gr.) a powerful anthelmintic of great value in "hook worm disease" and nematod infections of intestinal tract generally. Smaller doses destroy the filaria sanguinis hominis as found in chyluria. In small doses (I to 3 gr.) it is antiseptic, and used in gastric fermentation. Locally, it is a pleasant antiseptic, used in nasal catarrh and in washes, gargles, and spraying solutions. Unfortunately, it is rather expensive and also attracts flies, which will not do in surgery.