Mix together butter, brown sugar and baking soda dissolved in water.
In separate bowl, mix together flour, cinnamon, nutmeg, cloves and mace.
Combine with butter mixture.
Roll dough into 2 loaves, each 3 - 1/2 x 10".
Chill overnight in refrigerator.
Slice into one-fourth inch slices.
Bake in preheated 350 degree oven for 10 minutes or until slightly browned.