CONSERVATORIES AND SMALL GREENHOUSES 165 
from the figures given in the first part of this chap- 
ter, the north wall, and purlin braces from the 
Fig. 4—A simple form 
of lean-to greenhouse 
where there is an avail- 
able sheltering wall but 
with first-story windows. 
The inner slope or valley 
should be drained 
ridge posts, being the only details of construction 
not included there. 
A simple way of greatly increasing the capacity 
Fig. 5—The simplest of 
all “ greenhouses,” which 
is in reality little more 
than a deep coldframe 
with an opening into the 
cellar 
of the ordinary hotbed or coldframe, is to build it 
next to a cellar window, so that it will receive some 
artificial heat, and can be got at, from the inside, in 
any weather. Several sashes can be used, and the 
