This is a recipe taken from a Magic Baking Powder promotional booklet aimed at the Canadian market. Though there is no date on it, the cars in the graphics are pre 1950, I think perhaps the 1920s or 30s. This was one of
"Six Prize Winning Recipes: Each recipe on this page won a first prize of
Cream butter with 1/3 cup sugar. Beat egg whites stiffly and add 1/2 cup sugar. Put aside. Beat egg yolks with remaining sugar and add to first mixture, heating well. Mix in lightly the egg whites. Flavor with vanilla. Pour in cake pans, well greased, and cook from 25 to 30 minutes in oven375 F. Spread marshmallow between layers and cover cake with Foaming Icing.