This section is from the book "The Gardener's Monthly And Horticulturist V18", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
I notice, in Gardener's Monthly for December, a communication in regard to the poison of rhus. I have suffered many times from the poison of Rhus toxicodendron (L.) and Rhus venenata, (D. C.) In New England there were many popular remedies for this poison. Among these were a strong infusion of white ash bark Fraxinus Americana (L.), of sweet fern Comptonia, and of the common everlasting Gnaphalium polycephalum, (Mich )
The most speedily effective remedy I know, is a solution of the bichloride of mercury - corrosive sublimate - used as a wash. The only effective vegetable remedy I have ever seen used, is a cold infusion of the roots of Nabalus albus (Hook.) var. serpentaria, N. altissimus (Hook.) and N. fra-seri, (D. C.,) all of which have similar properties.
The tuberous roots should be bruised and infused in cold water - and this infusion should be used as a drink - compresses wet with it should be applied to the affected part and kept wet. It is really a safe and effective remedy.
Corrosive sublimate is a very active, and perhaps, if used strong, not always a safe application.