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"[Plin. Nat. 27.62.] - THE GALLIDRAGA: ONE REMEDY.
Xenocrates gives the name of "gallidraga" to a plant which resembles the leucacanthus, and grows in the marshes. It is a prickly plant, with a tall, ferulaceous stem, surmounted with a head somewhat similar to an egg in appearance. When this head is growing, in summer, small worms, he says, are generated, which are put away in a box for keeping, and are attached as an amulet, with bread, to the arm on the side on which tooth-ache is felt; indeed it is quite wonderful, he says, how soon the pain is removed. These worms, however, are of no use after the end of a year, or in cases where they have been allowed to touch the ground. "
(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.)