cream together the butter, , sugar, egg yolks, ginger, cinnamon, mace, and lemon juice. Sift together flour, salt, baking powder, add beer molasses and soda to flour, then stir together the butter mixture with the flour mixture. Fold in stifly beaten egg whites, Pour into two, greased, 9 inch cake pans. Bake 35 minutes in 350 degree oven.