Tar and its constituents act on various mucous membranes.

Its skin symptoms most important. A great cough medicine. Bronchial irritation after influenza (Kreosot; Kali bich). Scaly eruptions. Much itching. Constant vomiting of blackish fluid, with pain in stomach. Alopecia (Fluor ac).

Chest.--Pain at a spot about the third left costal cartilage where it joins the rib. Rales through the lungs, and muco-purulent sputum; offensive odor and taste. Chronic bronchitis.

Skin.--Cracked; itches intolerably; bleeds on scratching. Eruptions on back of hands.

Relationship.--Compare its constituents: Kreosol; Petrol; Pinus; Eupion; Terebinth; Carbolic acid.

Dose.--First to sixth potency.