158 GARDENING INDOORS AND UNDER GLASS 
terial for such a house would cost, and how to erect 
it. Almost every dwelling house has some shel- 
tered corner or wall where some glass “ lean-to ” 
could easily be added, and the shape and dimensions 
can be made to suit the special advantages offered. 
We will consider a simple house of the lean-to 
type, requiring a wall, to begin with, 20 feet long 
Fig. 2—Floor plan of the 
lean-to type of green- 
house shown in section 
on the opposite page. 
and 7 feet high, down to the ground, or a foot or 
so below it, if you can dig out. Below is listed the 
material such a house would require. With modern 
patented framing methods such a house has been 
estimated by greenhouse building companies to cost, 
for the material only, from $325 to $400. Yet 
you can have a wooden house that will serve your 
purpose at a cost for materials of $61 and, if 
you do not care to put it together yourself, a labor 
cost of, say, one-third more. 
As our north wall is already in place, we have 
only four surfaces to consider, as the accompany- 
ing diagram shows—namely, south wall, gable 
ends, roof and openings. For the roof we will re- 
