To preserve Yeast.
When you have plenty of yeast begin to save it in the following manner; whisk it until it becomes thin, then get a large wooden dish, wash it very nicely, and when quite dry, lay a layer of yeast over the inside with a soft brush; let it dry, then put another layer in the same manner, and so do until you have a sufficient quantity, observing that each coat dry thoroughly before another be added. It may be put on two or three inches thick, and will keep several months; when to be used cut a piece out; stir it in warm water.
If to be used for brewing, keep it by dipping large handfuls of birch tied together; and when dry, repeat the dipping once. You may thus do as many as you please; but take care that no dust comes to them, or the vessel in which it has been prepared as before. When the wort be set to work, throw into it one of these bunches, and it will do as well as with fresh yeast; but if mixed with a small quantity first, and then added to the whole, it will work sooner.