Chocolate Double Fudge Cake
["4 (1 oz. each) sq. unsweetened chocolate", "1/2 c. sugar", "1 3/4 c. unsifted all-purpose flour", "1 tsp. baking soda", "1 tsp. salt", "1/2 c. butter, softened", "1 1/2 c. sugar", "3 eggs", "2/3 c. milk", "1 tsp. vanilla"]
["Preheat oven to 350\u00b0.", "Grease and flour three 8-inch pans."]
["unsweetened chocolate", "sugar", "flour", "baking soda", "salt", "butter", "sugar", "eggs", "milk", "vanilla"]