3 c. sifted flour
1 1/2 c. sugar
1/3 c. cocoa
2 1/4 tsp. baking powder
1 1/2 tsp. baking soda
1 1/2 c. mayonnaise
1 1/2 c. water
1 1/2 tsp. vanilla

Sift together dry ingredients into large bowl. Stir in mayonnaise. Gradually stir in water and vanilla until smooth and blended. Pour into prepared pans. Bake in 350 degree moderate oven about 30 minutes or until cake tests done.