Maple Waffles

Beat the yolks of 2 eggs, add a teaspoon of salt, ¼ cup of maple sugar, and 1 cup of sour milk, into which has been placed a pinch of soda. Sift into this 2 ½ cups of flour and stir until the batter is perfectly smooth, then add a tablespoon of melted butter. The well-beaten whites of the 2 eggs should now be stirred in, and last of all, 2 ½ teaspoons of baking powder; beat the whole thoroughly, filling the hot waffle irons about two-thirds full. If the batter should be too thick, use a little water for thinning.