This section is from the book "An Experimental History Of The Materia Medica", by William Lewis.
Fuligo Ligni Pharm. Edinb. Wood soot: the smoke of burning wood condensed into a shining black concrete.
Wood soot has a disagreeable smell, and a pungent, bitter, niauseous taste: the more re-sinous the wood, the bitterer is the foot. On a chemical analysis, it is resolved into a volatile alkaline salt, an empyreumatic oil, a fist alkali, and an insipid earth. The volatile salt and spirit are sometimes kept in the shops, and have in some cases been preferred to those of the animal kingdom.
Wood foot is directed in hysteric cases, and in different nervous disorders, as an antispas-modic and corroborant. It is used chiefly in the form of a spirituous tincture, in conjunction, commonly, with afafetida or other materials of similar intention: the officinal tincture is drawn from two ounces of foot and one of afafetida, with a pint of proof and a pint of rectified spirit. The virtues of the foot are extracted, almost equally, by proof spirit, rectisied spirit, and water; each of which, if the foot is of a good kind, dissolves about one fourth of it. The extracts, obtained by infpiffating the filtered solutions, are excessively bitter: the spirituous extract retains most perfectly the peculiar flavour of the foot.