GBEENH0D8E. 



146 



GREENHOUSE. 



roof (e) is formed of boards, and to the outer part of the wall. The 

 these project so as to form a coping | next advance to heating greenhouses 



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4.4I4M 



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FIG. 30. — PORTABLE GREENHOUSE. 



with manure is using smoke flues ; i out of fashion, are now being 

 and these, after having been long I pai-tially revived ; hot water pipes, 



riG, 31. — CIRCULAR PORTABLE GREENHOUSE. 



however, are still generally substi- i house, heated by hot water, is 

 j tuted for them. A common green- 1 shown in Jiff. 29, which contains a 



