125. Ferrarium: i.e. the sediment at the bottom of the tub in which the iron has been Immersed; it is cold and dry; it has the constraining virtue; it is of benefit against podagra and arthritis. If the water which has been boiled by the iron be put in a bath, it will stop excessive sweating. A boiling up may be made of water in which iron has been immersed and of rain water, and the steam allowed under the patient with dysentery.