Combine flour, yeast, sugar, salt and soda in a large bowl. Heat together milk and water until very warm (120 - 130 degrees). Add dry ingredients and beat well. Stir in remaining flour to make a stiff batter. Spoon into 2 loaf pans that have been greased and sprinkled with cornmeal. Sprinkle cornmeal on top. Cover and let stand in warm place for 45 minutes. Bake at 400 for 25 minutes.