Mother's Banana Nut Bread 2

1/2 c. butter or margarine
2 eggs, separated
1 tsp. soda
2 c. sifted flour
1/4 tsp. salt
3/4 c. sugar
3 med. bananas
3 tbsp. buttermilk
1/2 c. chopped walnuts

Cream butter with sugar; beat egg yolks and add. Add mashed bananas. Add soda to buttermilk. Add to mixture along with flour, nuts and salt. beat whites stiff, fold into mixture. Bake in greased loaf pan at 350 degrees for 1 hour.