For yeast

Sarah Rutledge, The Carolina Housewife, by a Lady of Charleston (Charleston, S.C.: W. R. Babcock & Co., 1847), 11-12.

To a quart of strong hop tea add a spoonful of flour, a spoonful of corn flour, and a spoonful of brown sugar; stir them well in, and bottle the mixture, which must be closely corked, and the cork tied down. Set in a warm place until it ferments. The hop tea must be cold before the other ingredients are added.