Portable plazcd Structures. 



123 



10 



11 



12 



d 



q^ 





^ 



and a boiler placed between 

 every alternate division [a a). 

 Alon^f the whole lenath of 

 border, a line of strongoak posts 

 {bh)^ placed at a given distance 

 from the wall, and sunk level 

 with the soil, would form a suf- 

 ficient base to hold a sill, or 

 plate, upon which to secure 

 the rafters that may be fastened 

 to the wall at top in the same 

 manner. Such a foundation to 

 a forcing-house would not in- 

 terfere with the roots, but allow 

 them the full scope of the 

 border. In the present ex- 

 ample [fig. 10.), Nos. 2. and 3. 

 would be the first forced divi- 

 sions, and Nos. 1. and 4. the 

 last : they must therefore be 

 planted with sorts to suit ac- 

 cordingly. The houses, in the 

 first instance, would be placed 

 together, as \x\fig. 11. a a; and 

 heated by pipes [bb). When the 

 forcing of these divisions is 

 finished, the glass and pipes 

 must be moved to Nos. 1. and 

 4., which must be exactly like 

 the last : the houses would then 

 be placed as shown at fig. 12. 

 The first forced trees or vines 

 would be greatly benefited by 

 being fully exposed to the 

 weather; while the late ones 

 would be enabled to perfect 

 their crop of fruit, and provide 

 a supply of well-ripened wood ; 

 a cure, in my opinion, for 

 almost all the ills that trees are 

 heirs to. The vines may be 

 planted and trained as shown in 

 the sections, figs. 13, 14.; so 



that they may reap the benefit of the wall when not under glass. 

 A few of these houses would produce a great quantity of 

 fruit ; double the quantity afforded by those in present use. 

 Whatever number of houses may be deemed necessary in any 





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