40 



CELERY CULTURE 



flue, or by means of radiating pipes supplied with 

 steam or hot water from a dwelHng or other heat- 

 ing plant. For a permanent bed in which ferment- 

 ing manure is to supply the heat a pit 24 to 36 

 inches in depth should be provided. Connecting 

 to the bottom of the pit there should be a drain 

 to prevent the accumulation of water during a rainy 



'^i^'^t MANURE ^'^^'^^S 



FIG. 12 — CROSS-SECTION OF PERMANENT HOTBED 



season. The sides and ends of the pit should be 

 supported by a lining of boards, brick, concrete, 

 or stone, but two-inch planks are most commonly 

 used. For illustration of permanent hotbed con- 

 struction see Fig. 12. 



Coverings for Hotbeds. — Standard hotbed sash 

 are 3x6 feet in size, and are usually constructed 

 of white pine or cypress. As a rule, hotbed sash 

 can be purchased cheaper than they can be made 



