Put 3 1/2 cups flour, yeast, sugar and salt into large bowl. Mix together, then add warm water and melted butter to dry mixture. Blend together till moistened and beat well to incorporate air into batter. Gradually add remaining flour until you have a stiff batter. Cover and let rise in warm place until it doubles. This takes about half an hour.
Stir the batter down and spread in a greased loaf pan. Cover and allow to rise till batter reaches the top of the pans. Bake at 350 degrees Fahrenheit (176.6 degrees Celsius) until golden brown. Brush tops with butter as soon as you remove loaves from oven, then, carefully remove from the pans and cool on wire rack.