Sour Cream Pound Cake

Sour Cream Pound Cake
3 scant cups sugar
2 sticks margarine
6 eggs
3 cups sifted flour
8 oz sour cream
1/2 teaspoon salt
1/4 teaspoon soda
1 teaspoon vanilla

Grease and flour 10' tube pan. Preheat oven to 350 degrees. Sift flour and soda 3 times. Add salt to egg whites and beat to soft peak. Cream butter and sugar. Add vanilla and a pinch of salt. Add one egg yolk at a time; beat well. Add flour and soda alternately with sour cream. Fold in egg whietes. Bake one hour at 350.