REQUIREMENTS OF A FORCING-HOUSE. ^^ 



are only high enough to allow of room for the plants to be 

 grown under the glass, or, in the case of shed-houses, to 

 give a proper slope to the roof. It is a common practice to 

 secure head room in the forcing-house by sinking the walks 

 below the ground level. In this way, the house is kept low, 

 thus saving in cost of construction andjn exposure to winds. 

 Such sunken walks are shown in Figs, i and 3 (pages 17 and 

 18). It is always handier, however, to have the main walks 

 on a level with the surface, thus avoiding steps in passing to 

 and from the establishment. In wet or springy ground it is 



/. A simple even-span, to feet wide. 



important to avoid sinking the house. The roof of the 

 forcing-house should be as flat as is consistent with the 

 ready shedding of rain and snow, in order that all the 

 plants may grow close under the roof; for it should be 

 said that plants are usually more stocky and productive 

 and healthy when grown near the glass. The house should 

 be of the lightest possible construction in order to gain 

 sunlight, particularly if tomatoes, melons, cauliflowers and 

 other sun-loving plants are to be grown. 



There are three general types or shapes of houses in 

 common use for the forcing of vegetables. These are : The 



