52 GREENHOUSES 



direct sunlight to fall on both sides of the 

 house for an approximately equal time dur- 

 ing the day, thus giving all the plants in the 

 house an equal chance. It also permits the 

 workroom to be placed on the north end, 

 where it will not shade the house. The 

 principal disadvantage is that during the 

 middle of the day, when the sun's rays are 

 most potent, they strike obliquely against 

 the roof an4 much heat and light is lost by 

 reflection. Moreover, a large part is cut off 

 by the sash bars and rafters. 



In the east and west arrangement, the di- 

 rect sunlight enters from the south side only, 

 and in the morning and afternoon strikes the 

 roof obliquely. During the middle of the 

 day, when it is most effective, it strikes al- 

 most at right angles, although it is not even- 

 ly distributed and the plants on the north 

 side of the house receive much less than 

 those on the south side. This would seem to 

 be a serious fault, but in practice is less 

 serious than in theory. Of no growers 

 whom the author consulted on this point, 

 38 were in favor of the north and south ar- 

 rangement, 42 were in favor of the east and 

 west and 30 expressed the opinion that there 

 is little or no difference. 



