26 THE CONSTRUCTION OF THE FORCING-HOUSE. 



In Fig. 10 the rafters are m place, and on the further 

 half the sash-bars have been put in between them, being 

 toe-nailed at the upper end to headers cut in between 

 the rafters. The space above these headers is to be cov- 

 ered by the ventilator sash. 



It is very doubtful, however, if it is ever necessary to use 



jo. Putting- up a rafter-and-sash-bar house. 



rafters in the construction of a forcing-house. The entire 

 roof should be built wholly of sash-bars, which run from the 

 sill or the plate to the peak, as shown in Figs. 12 and 13 

 (pages 28 and 29). This construction admits the greatest 

 amount of light to the house, and is also less expensive. 

 If purlines of steam pipe are freely used upon which to rest 



