Sourdough Biscuits From Starter

Mix 1 pint of flour and 1 tsp of salt with 1 pint of warm water or
canned milk. beat into a smooth batter. Keep in a warm place until
well soured or fermented. Add another teaspoon of salt and 1-1/2 tsp
of soda dissolved in 1/2 cup tepid water and enough flour to make the
dough easy to handle. Knead until dough in no longer sticky, cup up
into biscuits and cook in a pan containing plenty of grease.

Oregon: End of the Trail, 1951.