Elderberry grape jelly

3 lb Elderberries
      3 lb Half-ripe grapes
           Sugar
 
  Wash elderberries.  Remove stems.  Cover with water.  Cook until soft.
  Drain through jelly bag.  Wash grapes.  Remove stems. Cover with water,
  cook until soft.  Drain through jelly bag. Combine elderberry and grape
  juice in equal proportions.  Add 3/4 cup sugar to each cup juice. Boil
  rapidly until jelly sheets from spoon. The Household Searchlight