GLASS STRUCTURES 



107 



sections where fuel is high priced the beds might be partially 

 heated with manure. 



Fig. 42 shows a cross section of a lean-to house that is 

 easily adapted to most locations, but especially suited to 

 sidehills. It is twenty feet wide and may be made of any 

 length desired. It should have a boiler room on one end 

 or at the back side, as is most convenient. It should, of 

 course, extend east and west so that the slope will be 

 entirely to the south or southeast. The walls are made of 

 cedar posts tightly boarded up on both sides. The alleys 



Fig. 42. Cross section of lean-to greenhouse. 



are two feet wide and planked on each side. The roof is 

 shown made of permanent sash bars, but these might be 

 made of movable sash, as recommended for the model 

 forcing pit. One ventilator is at the top of the roof and 

 another is in the side wall. Two purlins extending the 

 length of the house are supported by small gas-pipe posts. 

 The north bench is four feet wide, raised three feet above 

 the alley, and is filled with six inches of soil, or it may be 

 used for seed boxes. The center bench is eight feet wide 

 and may be solid or raised. The south bench is shown 

 filled with stable manure, and is practically a hotbed. 



