This section is from the book "A Practitioner's Handbook Of Materia Medica And Therapeutics", by Thos. S. Blair. Also available from Amazon: A Practitioner's handbook of Materia Medica and Therapeutics.
Pix Liquida, Tar. Antiseptic, anticatarrhal, antispasmodic. Glyceritum picis liquidae, N. F., is a valuable expectorant in teaspoonful doses. It is a good vehicle for other agents acting in harmony with it. The syrup is similar, but the sugar therein is apt to disorder digestion. Vinum picis is another K. F. preparation, very much stronger in tar than the foregoing. It is a stimulating expectorant in teaspoonful doses. The oil of tar may be taken in 3I doses upon block sugar. Unguelltum picis liquida: (5°%) is used in scabby eruptions. psoriasis, tinea capitis, and other skin troubles.