Preheat oven to 325F. Butter and flour a 9x5 loaf pan. Cream the
butter, slowly add the sugar, and beat until light. Add the eggs, one
at a time, beating each in well. Stir in the flour, salt, and vanilla
or mace, and combine well. Spoon into the pan and bake for 1 1/4- 1
1/2 hours, or until a toothpick comes out clean. Cool in the pan for
5 minutes before turning out onto a rack. Serve very thin slices.
