It was customary to "watch the Fern" on Midsummer eve, when the plant put forth at dusk a blue flower, and a wonderful seed at midnight, which was carefully collected, and known as "wish seed." This gave the power to discover hidden treasures, whilst to drink the sap conferred perpetual youth. The Royal Fern (_Osmunda regalis_), grows abundantly in many parts of Great Britain, and is the stateliest of Ferns in its favourite watery haunts. It heeds a soil of bog earth, and is incorrectly styled "the flowering Fern," from its handsome spikes of fructification. One of its old English names is "Osmund, the Waterman"; and the white centre of its root has been called the heart of Osmund. This middle part boiled in some kind of liquor was supposed good for persons wounded, dry-beaten, and bruised, or that have fallen from some high place. The name "Osmund" is thought to be derived from _os_, the mouth, or _os_, bone, and _mundare_, to cleanse, or from _gross mond kraut_, the Greater Moonwort; but others refer it to Saint Osmund wading a river, whilst bearing the Christ on his shoulders. The root or rhizome has a mucilaginous slightly bitter taste. The tender sprigs of the plant at their first coming are "good to be put into balmes, oyles, and healing plasters." Dodonoeus says, "the harte of the root of [187] Osmonde is good against squattes, and bruises, heavie and grievous falles, and whatever hurte or dislocation soever it be." "A conserve of these buds," said Dr. Short of Sheffield, 1746, "is a specific in the rickets; and the roots stamped in water or gin till the liquor becometh a stiff mucilage, has cured many most deplorable pains of the back, that have confined the distracted sufferers close to bed for several weeks." This mucilage was to be rubbed over the vertebrae of the back each night and morning for five or six days together. Also for rickets, "take of the powdered roots with the whitest sugar, and sprinkle some thereof on the child's pap, and on all his liquid foods." "It maketh a noble remedy," said Dr. Bowles, "without any other medicine." The actual curative virtues of this Fern are most probably due to the salts of lime, potash, and other earths, which it derives in solution from the bog soil, and from the water in which it grows. On July 25th it is specially dedicated to St. Christopher, its patron saint.