72 



VEGETABLE GARDENING. 



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. Thealleys 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 extendingthe length 

 of the house are supported by small gas pipe posts. The 

 northerly bench is four feet wide, raised three feet above the 



Figure 32.— Cross section of lean-to greenhouse, 

 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 southerly bench is shown filled with 

 stable manure and is practically a hotbed. The same treat- 

 ment may also be given the center bench. But where the plan 

 is followed of making up a part of the benches with manure, it 

 is well to have some or all of the roof glazed with movable 

 sash, to facilitate the work of putting in and taking out the 

 manure. The use of stable manure to supplement the heating 

 apparatus, is a practice that may be economically followed in 

 1 ocations where coal is high priced and stable manure abund- 

 a nt. The heating arrangement could be either steam or hot 

 water with the flow pipes high up near the roof, as shown at A 

 and B and the returns at C and D. 



