Sift 5½ cups flour with salt, spices and soda and add to creamed mixture alternately with prune juice and brandy.
Mix with a wooden spoon.
Add this mixture to the fruit and nuts and blend well.the easiest way to blend this large amount of mixture is with your hands.
Beat egg whites until stiff and fold into mixture.
Measure into prapared pans and press well into the corners.
Heat oven to 275 °F.
Bake cakes in 8x4x3-inch pans for about 3 hours, in 9x5x3-inch pans or bundt pans for about 3 hours and 15 minutes and in 10-inch tube pans about 3 ½ hours or until a toothpick stuck in the center comes out clean.
Let stand in pans a few minutes, then turn out on racks and cool.
Strip off paper and wrap cakes in cheesecloth dampened with brandy and then in foil and store in a cool place.