Black Berry Preserves

Mash the berries with a potato masher. Measure the pulp and add one pint of sugar to each pint of pulp. Bring the mixture to a full bubble and cook 30 minutes. Be sure to skim the mixture while it is in the pot, so that the paraffin will seal properly. The best skimmer is a wooden spoon. Ladle the preserves into sterilized jars. Melt paraffin carefully, removing all bubbles with a sterilized spoon. Pour it until it is about 1/4 inch thick on top of each jar of preserv