While boiling potatoes I save the potato water, about one pint. After it is cooled and only luke warm, I soak in it one cake of yeast foam, one teaspoonful of sugar and a small pinch of ginger, and then let it dissolve until supper time; then take a quart of wheat flour and mix with a little warm water, or water and milk, and add your yeast so that the sponge will not be too thin, but like a stiff batter. Let it stand over night in a warm place to raise. Next morning I divide the sponge, using two thirds of it for wheat bread and one third for rye bread, as you can bake six loaves of bread from one cake of yeast; four of wheat and two of rye. To the two thirds part of sponge I take two quarts of wheat flour, one tablespoonful of salt and water enough to make quite a stiff dough. For the rye bread one quart of rye flour with one and one half cups of wheat flour and one teaspoonful of salt. Knead it same as for wheat bread, then let it raise again and when it has doubled in size, it is ready for the tins and after raising there until light, it is ready for the oven in which if hot it will bake in from three fourths to one hour. Before putting it in the oven, I usually wash it with luke warm milk to give it a nice brown color while baking.
Attributed to Mrs. John Bruegger.