5 



CONSTRUCTION. 



provided with glass roof sloping to the north. 

 Against the north wall may be placed a propa- 

 gating bed three and one-half feet wide, leaving 

 four and one-half feet clear space for a walk 

 and entrance to each house. If more than six 



11. Interior of shed shown in 10. Propagating bench on 



the right, supply pipes (two inch) on the 



left, shed eight leet wide. 



houses are in the block, the boiler should be 

 placed near the center in a pit dug beneath the 

 shed. If necessary, of course, the entire space 

 beneath the shed may be devoted to coal, a work- 



