The stinging effect of the true Nettle is caused by an acrid secretion contained in minute vesicles at the base of each of the stiff hairs; and urtication, or flogging, with Nettles, is an old external remedy, which was long practised for chronic rheumatism, and loss of muscular power.
"Herbal Simples Approved for Modern Uses of Cure"
William Thomas Fernie
In Russia, as a recent mode of treatment, urtication is now enthusiastically commended, that is, slapping, or pricking with a bundle of fresh Nettle twigs for one or more minutes, once, or several times in the day.
"Herbal Simples Approved for Modern Uses of Cure"
William Thomas Fernie
The urtication of this shame made plays And sonnets, as you'll find behind all deeds That mount to greatness, anger, hate, disgust, But, better, love.
"Toward the Gulf"
Edgar Lee Masters