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"[Plin. Nat. 26.56.] - SILAUS: ONE REMEDY.
Silaus 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, and is of great utility for affections of the bladder. In cases where that organ is affected with eruptions, it is used in combination with root of panaces, a plant which is otherwise bad for the bladder. The erratic apple, 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. Sea-nettle is employed too for the same purpose, daucus, and seed of plantago in wine.”
(The Natural History. Pliny the Elder. John Bostock, M.D., F.R.S. H.T. Riley, Esq., B.A. London. Taylor and Francis, Red Lion Court, Fleet Street. 1855.)