Boiled Flour

Take of fine flour one pound, tie it up in a linen cloth as tight as possible, and after frequently dipping it into cold water, dredge the outside with flour till a crust is formed round it, which will prevent the water soaking into it while boiling. Boil for a long time, and permit to cool, when it will become a hard, dry mass. This is to be grated, and prepared like arrow root. A good diet for children in diarrhea.

Source: The Housekeeper’s Friend: A Practical Cookbook