2181. The flued mushroom-house (fig. 653.) is an improvement on the shed, by being better calculated for growing them in winter. Provided it be placed in a dry situation the aspect, size, proportions, doors, or windows are of little consequence. To be sufficiently warmed by one fire in winter, it should not contain more than 10,000 cubic feet of air. As mushrooms will not thrive without some light, and at all events require air, it ought to have two or three windows or valves for these purposes.