Pick over, remove wilted leaves, and soak in cold water one quart sprouts. Cook in boiling salted water until soft, then drain. Wash celery and cut in pieces; there should be one and one-half cups. Melt three tablespoons butter, add celery, cook two minutes, add three tablespoons flour, and pour on gradually one and one-half cups scalded milk; add sprouts and turn mixture into a baking-dish. Cover with buttered crumbs and bake in a hot oven until crumbs are brown.