Take a small crock or large earthen pitcher, put into it a quart of warm water or half water and milk, one heaping teaspoonful of salt; then stir in as much buckwheat flour as will thicken it to rather a stiff batter; lastly, add half a cup of yeast; make it smooth, cover it up warm to rise over night; in the morning add a small, level teaspoonful of soda dissolved in a little warm water; this will remove any sour taste, if any, and increase the lightness.
Not a few object to eating buckwheat, as its tendency is to thicken the blood, and also to produce constipation; this can be remedied by making the batter one-third corn meal and two-thirds buckwheat, which makes the CAKES equally as good. Many prefer them in this way.
The Whitehouse Cookbook, by Mrs. F.L. Gillette (Year 1887)