1. In bowl cream butter and sugar. Add eggs, sour cream and vanilla, beating until well blended.

2. Sift flour, baking powder, salt, and baking soda together. Add gradually to cream mixture, beating after each addition.

3. Have the walnuts, cinnamon, and sugar mixed together.

4. Grease a tube pan. Turn half of the batter into the pan.

5. Sprinkle over the top half of the nut and sugar mixture.

6. Add remaining batter. Cover the top with the rest of nut and sugar mixture.

7. Bake in moderate oven (375 degrees) for 1 hour and 45 minutes.