Wash while fresh in strong soapsuds, first picking from the wool all the dirt that will come out. A little paraffin, 1 tablespoonful to 3 gal. water, will aid in removing the impurities. Continue to wash the skin in fresh suds till it is white and clean. Then dissolve 1/2 lb. each of salt and alum in 3 pints boiling water, put into it water enough to cover the skin, which should soak in the solution 12 hours, and then be hung on a line to drain. When nearly dry, nail it, wool side in, on a board, or the side of a barn, to dry. Rub into the skin 1 oz. each of pulverized alum and saltpetre, and if the skin is large double the quantity. Rub for an hour or two. Fold the skin sides together, and hang the skin away for 3 days, rubbing it every day or till perfectly dry. Then with blunt knife clear the skin of impurities, rub it with pumice or rottenstone, trim it into shape, and you have a door mat that will last a lifetime. If it is to be dyed, have a shallow vessel as large as the skin in which to prepare the dye, so that the skin can be laid wool-side down smoothly into the vessel that all parts may be equally immersed in the dye. This should not be more than an inch deep, otherwise the skin might be injured by the hot dye.