This section of the book is from the "Household Companion: The Model CookBook" book
Take half pound grated cheese and quarter cupful milk or cream, put into a double-boiler, and stir until the cheese is melted. Beat one egg, and add mustard, salt, and cayenne pepper; then pour the milk and cheese over the mixture. Add a teaspoonful of butter, return to the boiler, and cook until it thickens, stirring constantly. Pour it over dry toast.