Rectangular porcelain vessel used in the culturing of the first isolated therapeutic penicillin. The vessel is made of fired porcelain, with the interior glazed for the growth of molds and the exterior rough and unglazed for easier handling. The base of the vessel is rectangular and flat, with slightly rounded corners, and the front has a spout extending from one side at a sharp angle. The spout has a wide-mouthed opening. Exterior is a dull gray color.