Chicken stock, 1 quart,

Chopped mushrooms, 1/4 pound,

Butter, 2 tablespoons,

Flour, 2 tablespoons,

Onion, 1 slice,

Cream, 1 cup,

Salt, baking-powder.

Remove the fat from a quart of chicken stock and stir into it a quarter of a pound of mushrooms chopped, and a slice of onion. Simmer for 20 minutes, and then run it through a colander and return it to the fire. Thicken with the butter and flour, and stir until smooth; then beat in a cup of rich cream, containing a pinch of baking-powder, and season with salt and pepper.