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Blackberry Jelly

Heat the berries in a double boiler, waterless cooker, or in an earthen jar set in a pan of hot water, until they are softened, and the juice flows freely. Let drain as usual. Heat quickly to the boiling point, let boil twenty minutes, add an equal measure of sugar made hot in the oven, and let boil about one minute, stirring meanwhile. Skim and turn into glasses. Second and third extractions may be made from the pulp, or the remaining juice may be pressed from the contents of the bag. Use half a cup of sugar to each cup of liquid secured by extraction 2 and 3. Or boil all extractions after the first together, and when well reduced, add three fourths cup of sugar for each cup of juice, and let boil to jelly.