I'm looking through an old cookbook, ''The Art of German Cooking and Baking'' by Lina Meier (2nd Ed., 1922, Milwaukee, file on wikipedia). There is a recipe for waffles here which calls for "1-2 cents worth of yeast." How much yeast actually is it calling for?
I know how much yeast two American pennies will buy me today: none. Practically, the smallest quantity of yeast I can buy today is an envelope of Fleischmann's active dry yeast, which, according to the internet, weighs about 7 grams (0.25 oz).
I've reproduced the recipe below since it is out of copyright and I've heard yeast is one of those ingredients where you've got to consider what's going on in the rest of the recipe. All I'm concerned about is the 'yeast' ingredient: how much does this mean in today's measurements.
No. 15—YEAST WAFFLES. Quantity for 6 Persons. ½ lb. of butter ¾ pt. of milk or cream 4 eggs 1–2 cents worth of yeast ¼ cup of sugar ½ lb. of flour ½ grated lemon peel Lard for baking 1 pinch of nutmeg Preparation: Cream the butter, stir in eggs, sugar, lemon peel, nutmeg. The yeast is dissolved in the cream which has been warmed, stirred into the mixture, then flour added to make a stiff batter. Set to rise in a warm place. Grease the waffle iron, put in 3 tablespoonfuls of batter, close the iron and bake the waffles light brown, turning the iron to bake on both sides. Waffles must be baked and served quickly, because they are apt to lose their crispness and become tough. When serving, sprinkle with sugar and cinnamon.