ESSENTIAL FEATURES 107 
floor of the house should receive the direct rays of the sun at some 
time during each day (Fig. 66). 
Freedom from Moisture.—Three kinds of moisture are frequently 
present in poultry houses where layers are kept: (1) Atmospheric 
moisture, (2) condensation moisture, and (3) soil moisture. 
Atmospheric moisture is always bad if the room is poorly 
ventilated. : 
Sunlight all of the year 
ey 
Mo direct Suntight 
¥ic. 66.—Floor of standard multiple-unit laying house, showing distribution of sunlight 
at different seasons, sun elevation at 10 o'clock. 
Condensation moisture is caused by the moisture condensing 
from the air and hanging in drops from the roof and rafters. This 
is sometimes caused by lack of sufficient head room, but more often 
by insufficient fresh air. A concrete or solid masonry bank wall is 
very damp, as it acts as a wick, sucking outside moisture through 
during wet weather. This condition can be corrected by replacing 
glass sash in the front with muslin, thus insuring circulation. 
