THE MUSHROOM-HOUSE. 



ternal temperature, as will be seen by the engraving. 

 The walls are hollow, and banked round with the soil 

 excavated from the interior. The roof is thatched with 

 reeds, and the ends stud- work, lined inside with boards, 

 and outside with split larch poles : the cavity to be filled 

 with sawdust or cut straw ; a small diamond-shaped ven- 

 tilator, hung on pivots, to be fixed in each end. The 

 floor may be of concrete, or burnt clay well rammed ; 

 and the beds are retained in their place by boards nailed 

 to good oak posts. Care should be taken to put in 

 efficient drains, so that no stagnant damp may exist 

 about the building. 



.GROUND. 



CEILING 





-J=FJ/EJ 



Fig. 5. Section of mushroom-house at Frogmore. 

 Though the preceding cuts show how we may best 

 attain our object, a few more illustrations of mushroom- 



