Propagation 69 



placed on the surface and covered with sand, as has al- 

 ready been explained. 



Hotbeds which are to be permanent are sometimes 

 made of brick, stone or concrete, but growers generally 

 prefer the cheap practical bed just described. This 

 can be used for a few years and when demolished by 

 decay the expense of building new is not so great as to 

 offset the advantage of being able to move the bed at 

 will. 



Hothed, — flue-heated. 



In the more northern areas and where it is difficult 

 to obtain a sufficient quantity of the proper kind of 

 manure, heat for the hotbed may be secured from a 

 stove or furnace through conduction pipes under the 

 beds. The flue-heated bed may be constructed for one 

 or two tiers of sash. When two tiers are used, they 

 are elevated in the center and slope to each side. Hot- 

 beds so equipped are frequently made of brick, stone 

 or concrete as they are usually intended to be more or 

 less permanent.. However, a temporary structure may 

 be made of wood. J. 0. 0. Price,^ gives the following 

 discussion on the construction of a flue-heated hotbed; 

 " A flue-heated hot-bed may be constructed of con- 

 crete or boards for sides. The first is permanent, while 

 the boards will rot out after a period of time. If the 

 boards are treated with creosote they will last much 

 longer. The frame should be located on a well-drained 

 place, sloping to the south or southeast, so as to get the 

 full benefit of the sun's rays and be protected from 

 north and north-west winds. When possible, the frame 



1 Circ. 15, Ala. Exp. Sta. 



