This section is from the book "An Experimental History Of The Materia Medica", by William Lewis.
Vermicularis, Piper murale, Sedum minus. Sempervivum minus vermiculatum acre C. B. Sedum acre Linn. Wallpepper or Stonecrop: a small plant, having its slalks covered with little slefhy conical leaves set thick together in the manner of scales: on the tops appear pentapetalous yellow flowers, each of which is followed by several pods full of small seeds. It is annual, grows on old walls and dry stony grounds, and flowers in July.
This plant has a very acrid taste, and no remarkable smell: applied externally, it vesicates the part: taken internally, in no great quantity, it proves strongly emetic. Its active matter appears, from the accounts given by authors, to be in great part forced out along with the watery juice by expression; to dissolve both in water and fermented liquors by insusion; and not to be diffipated, or not soon, by boiling. It is said to have been used with success in sundry chronical disorders (a), but its durable acrimony, and the great vehemence of its operation, have prevented its being received in practice.