This section is from the book "Mrs. Rorer's Diet For The Sick", by Sarah Tyson Rorer. Also available from Amazon: Mrs. Rorer's Diet For The Sick.
Wash a half pint of fresh cranberries in cold water, put them in a saucepan with a pint of cold water, bring to a boil, boil five minutes and press through a colander; add a cupful of sugar. Cover a tablespoonful of vegetable gelatin with two tablespoonfuls of cold water, let it soak ten minutes. Boil the cranberries, gelatin and sugar together for five minutes, strain through cheesecloth and turn into a mold to harden.