54 TUE PRINCIPLES OF FLORICULTURE 



that they can be maintained with a minimum amount of 

 labor. They should also be located so they will not detract 

 from the efficiency of growing houses because of their 

 shade. If they can be placed on the north side of the 

 range, this is not so likely to occur. When flower crops 

 are grown, it is especially important that the boiler room 

 be far enough away, or so placed that shade from the 

 chimney does not fall on the greenhouse. 



TYPES OF HOUSES 



For commercial purposes there are practically but three 

 types of houses used; namely even-span, uneven-span, 

 and ridge-and-furrow. Occasionally lean-to houses be- 

 come important factors in ranges because they econo- 

 mize space. 



49. Even-span houses. Even-span houses have the 

 advantage of adaptation to almost any location. They 

 are the general utility houses adapted for almost all pur- 

 poses. Light conditions, however, are not so intense as in 

 uneven-span houses, therefore they are better suited for 

 those crops which do not require maximum light con- 

 ditions. They are for the most part satisfactory for 

 carnations, violets, sweet peas and bedding plants. They 

 may be built any length, and the width may vary from 

 nine to sixty feet, or even wider, according to the re- 

 quirements of the grower. In deciding on the width, 

 the number and width of the walks and of the benches 

 which the house is to contain must first be determined so 

 there may be economy in interior arrangement. 



50. Uneven-span houses. The uneven-span house is 

 more distinctly a forcing house. As will be noticed in 

 the next chapter under the consideration of the construe- 



