SECTION III. 



STRUCTURES ADAPTED TO PARTICULAR PURPOSES 



1. Forcing-houses, culinary houses, ^c. — Forcing-houses are 

 erected with the intention of forming an artificial climate for 

 the culture of tender plants and vegetables in winter and early 

 spring. For this purpose artificial heat is employed to keep up 

 an exciting temperature, and, therefore, it is desirable that they 

 should be constructed in relation to this end. 



Until very lately, the form in which forcing-houses were con- 

 structed was that of lean-to, or single-roofed, houses, with sheds 

 or garden-offices on the back of them. When it is not neces- 

 sary that light should be received from all sides of the house, 

 these lean-to houses answer very well, and possess many con- 

 veniences which cannot be obtained with span-roofs. Climbing 

 plants, such as grape-vines, trained beneath the glass, and 

 peaches, trained in the same manner, derive a sufficiency of 

 light from the single roof to enable them to bring their fruit to 

 perfection; and it is very doubtful if single roofs will ever be 

 entirely superseded for the purposes of winter forcing. 



Fig. 3. 



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Fig. 3 is the section of a pit for winter forcing, which we 



consider well fitted for the several purposes to which these pits 

 4# 



