Preheat oven 325 degrees. In mixing bowl cream butter and sugar. Add 1 egg at a time, beating after each. Gradually add sifted flour, 1/2 cup at a time, til all blended. Add lemon juice and lemon rind, blend inches. Pour into a buttered and floured tube pan. Bake 1hr 15mins to 1hr 30 mins; Til toothpick in center comes out clean.