Silaus1275 is a plant which grows in running streams with a gravelly bed. It bears some resemblance to parsley, and is a cubit in height. It is cooked in the same manner as the acid vegetables,1276 and is of great utility for affections of the bladder. In cases where that organ is affected with eruptions,1277 it is used in combination with root of panaces,1278 a plant which is otherwise bad for the bladder. The erratic apple,1279 too, is an expellent of calculi. For this purpose, a pound of the root is boiled down to one half in a congius of wine, and one hemina of the decoction is taken for three consecutive days, the remainder being taken in wine with sium.1280 Sea-nettle1281 is employed too for the same purpose, daucus,1282 and seed of plantago in wine.