GLASS STRUCTURES 57 



for the late blooms will not be as high, however, for they 

 are produced at a season of the year when the market 

 supply is abundant and when there is less demand for 

 products. Side ventilation in ridge-and-furrow houses is 

 out of the question, and there is considerable breakage 

 of glass near the gutter of the adjoining house, from snow 

 and ice which slide from the roof. 



52. Curvilinear houses. Houses with curvilinear 

 roofs were at one time much in demand, especially on 

 private estates and in city parks, where houses built along 

 especially artistic lines were desired. It was also thought 

 that curved glass was especially effective, for more 

 glass area was brought directly at right angles to the sun's 

 rays than in straight-roofed houses. These never proved 

 efficient houses, however, in which to grow plants, and they 

 were more especially used for conservatories. The 

 curved members of construction and curved glass were 

 expensive, and this type of house is less frequently built 

 at the present time than formerly. Houses with straight 

 roofs, but with curved glass at the eaves, are now con- 

 sidered preferable to houses with curvilinear roofs. These 

 are attractive to the eye and also are excellent houses in 

 which to grow plants. 



SIMPLE GLASS STRUCTURES, THEIR CONSTRUCTION AND 

 EQUIPMENT 



It is possible to construct greenhouses less pretentious 

 than those already described. Many simple structures 

 for housing plants over winter are efficient and desirable. 

 They may be attached to the dwelling house, the stable, 

 the garage, or they may be separate buildings. If at- 

 tached to a dwelling house, the boiler which heats the 



