340 



(jlass 



built beds, are less exposed to winds, and are permanent; 

 but they are more expensive in the beginning. The pits 

 can also be filled in autumn with manure or litter, and if 

 this is pitched out at any time in winter or spring, an 

 unfrozen area is at once ready for the making of the hot- 

 bed. Pits should be tile-drained, unless the soil is very 

 loose and the bottom is below the frost line of the sur- 

 rounding unprotected land. If many frames are employed, 

 they should extend in parallel rows, six or seven feet apart, 

 so that a man walking between can water or tend two runs. 



Building the frame. 



The common type of frame is shown in Fig. 208. It 

 is a little over 12 feet long, is 6 feet wide, and is covered 

 with four 3x6 sash. It is sometimes made of ordinary 



208. A frame. In this case the frame is njortised together, so that the 

 material can be taken apart and stored. 



