Meanwhile, in a bowl, sift the flour with the sugar, baking powder and salt. Stir in the cornmeal. Add the milk and eggs and stir lightly. Add the melted butter and stir just until blended. Scrape the batter into the hot skillets; the oil should bubble. Transfer the skillets to the oven and bake the corn breads for about 18 minutes, or until the centers spring back when gently pressed. Turn the corn breads out onto a rack to cool.