230. Quercus: i.e. the oak; cold and dry in the second degree; it has the constrictive and drying virtues in its wood, its foliage and its fruit. If the foliage of this tree be finely pounded and put in wounds, it will stop the flux of blood from the wounds and it will heal them. If the fresh foliage of this tree be boiled in water and drunk, it will stop dysentery and any flux of blood and, if it be applied to the anus, it will help with tenesmus. If the bark of oak be boiled in water and the water be drunk, and the ill person be put sitting on the bark, it will stop the illnesses we have mentioned. As regards the acorns of the oak, they have the ability to provoke the urine and to stop the flux, and there is a greater styptic virtue in the shell of the acorn than in the fruit proper, and in the cup of the acorn than in the shell, and it is said that, of all styptic things, it is the cup of the acorn of the oak that is the most styptic of them.