Cream sugar, butter and the 12 egg yolks. Add flour (minus 1 cup) and mix with the creamed mixture. Flour the candied fruits, raisins and nuts with 1 cup of the flour and add to creamed mixture; mix well. Add whiskey and vanilla; mix well. Beat egg whites until stiff peaks form. Fold egg whites into creamed mixture and mix well. Pour batter in waxed, greased loaf pans (over 1/2 full). Bake at 300 degrees for 1 hour.