GREENHOUSE ARCHITECTURE 57 



thus reduced. (6) Because there is less ex- 

 posed wall surface, and because the interior 

 houses are protected, they require less fuel 

 than do separate houses. 



One of the chief objections to the ridge- 

 and-furrow system of construction is the dif- 



Fig. 29. Ridge-and-furrow houses wrecked by a storm 



ficulty of removing snow from between the 

 houses in regions subject to heavy snowfall. 

 Other disadvantages are: (i) The center 

 houses are shaded more or less, (2) side light 

 and side ventilation can not be had, and (3) 

 soil and other materials must be carried into 

 the house from the end instead of being put in 

 at side openings. The latter is a serious ob- 



