Descriptions of a Pine- House and Pits. 501 



Note by the Secretary. 



The annexed engraving, which contains the ground plans 

 and sections of the house and pit, has been taken from the 

 models presented to the Society by Mr. Holford. 



Reference to the Plate. 

 Fruiting House. 

 A. Passage along the back. 

 B B. Iron columns supporting the rafters. 

 CC. Tan pit. 



D. Steam cock to turn the steam on or off from a main 



pipe, communicating with other houses. 



E. Brick flue for heating the house when the steam appa- 



ratus is not in use. 



Succession Pits. 



F F F. Linings of hot dung or leaves. 



G G. Tan in which the plants are plunged. 



H H. Moveable shutters for confining the heat of the linings, 

 and protecting them from wet or cold. 



I. Metal pipe of three or four inches diameter, placed ob- 

 liquely against the open brick work, the lowest end 

 being at the bottom of the pit and communicating with 

 the air funnel, the other rising to near the top of the 

 lining at the opposite end. 



K K. Tunnel communicating with the open air. 



L L. Ends of the small vertical pipes through which the 

 warm air passes into the pits. 



