1 lb. butter
1 lb. sifted cake flour
10 eggs, separated
2 tsp. baking powder
1 lb. sugar
2 tsp. vanilla
1/2 tsp. salt

Cream butter; blend in flour and baking powder until mixture is mealy. Beat egg yolks, sugar and vanilla until fluffy. Add to first mixture gradually, beating 15 minutes. Fold in stiffly beaten egg whites. Beat until well blended. Pour into two greased and floured loaf pans. Bake in slow oven 325 degrees approximately one hour.