Preheat
oven to 180C
and position oven rack about centre of oven. Soften butter and beat
in the two sugars until soft and well blended.
Beat
eggs to combine and gradually beat into butter sugar mixture. Gradually
beat in milk and vanilla.
Sift
flour, cocoa, salt, baking powder and baking soda onto a paper or into
a bowl.
Carefully
stir dry ingredients into previous mixture and mix thoroughly. Gradually
stir in boiling water. This will be a wet mixture.