Steep an eighth of an ounce of pressed, or a small handful of loose hops in a quart of boiling water for about five minutes. Strain the boiling infusion upon half a pint of flour, stirred to a smooth paste with a little cold water. Mix well, boil a minute; then add one ounce of salt and two ounces of white sugar. When lukewarm stir in a gill of liquid yeast or an ounce cake of compressed yeast dissolved in warm water. Let stand twenty-four hours, stirring occasionally, then cover closely, and set in a cool place. Yeast made in this manner will keep sweet for two weeks in summer, and much longer in winter, and can be used at any time during that period for starting a fresh supply of yeast, as well as for making bread.