Ice Water Cake
["6 egg whites, beaten stiff", "3 c. sugar", "3/4 c. butter", "3 tsp. hot water", "1 1/2 tsp. vanilla", "6 tsp. baking powder", "4 7/8 c. cake flour", "1/4 tsp. salt", "2 1/4 c. ice water"]
["Line pan with wax paper.", "Cream sugar, butter, hot water and vanilla.", "Sift baking powder, cake flour and salt.", "Add alternately with water.", "Fold in egg whites."]
["egg whites", "sugar", "butter", "water", "vanilla", "baking powder", "cake flour", "salt", "water"]