CHOCOLATE MARBLE CAKE

Put one ounce of  Chocolate and one tablespoonful of butter in a cup, and set this in a pan of boiling
water. Beat to a cream half a cupful of butter and one cupful of sugar. Gradually beat in half a cupful of milk. Now add the whites of six eggs beaten to a stiff froth, one teaspoonful of vanilla, and a cupful and a half of sifted flour, in which is mixed one teaspoonful of baking powder. Put about one-third of this mixture into another bowl, and stir the melted butter and chocolate into it. Drop the white-and-brown mixture in spoonfuls into a well buttered deep cake pan, and bake in a moderate oven for about forty-five minutes; or, the cake can be baked in a sheet and iced with a chocolate or white icing.