HOUSES TO BE RECOMMENDED. 25 
long span should face the 
sun. The short-span-to-the- 
south greenhouse, of which 
much has been said in recent 
years, is built with a very 
steep, short south roof, with 
the purpose of intercepting 
nearly all the sun’s rays and 
carrying them directly back 
into the farthermost corners 
of the house. Where high 
plants are to be grown near 
the front of the house, how- 
ever, so much shade is cast 
upon the rear plants as to 
seriously interfere with their 
growth. These houses have 
not yet come into general 
use for vegetable forcing, 
and they need not be fur- 
ther considered in this sum- 
Mary account. 
Of the various houses 
which are represented in the 
accompanying illustrations, 
Fig. 1 is the least satisfac- 
tory for forcing purposes, be- 
cause of its narrowness. In 
such slim houses there is 
not a sufficient body of air 
to guard against rapid fluc- 
tuations of temperature. 
ase 
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They cool off quickly ; and ate 
with variations in temper- Beet 
ature there arise serious = 
difficulties with insects and = 
fungi. Fig. 2 is an excellent ve 
