84 



PRACTICAL ELOKTCULTUKE. 



structure, which was too large and expensive for the wants 

 of beginners in floriculture. I will here show how other 

 houses of different designs and of smaller dimensions may 

 be heated on the same principle. Figure 20 shows three 

 of the usual ridge and furrow houses, which are sixty feet 

 long and eleven feet wide, each, with a furnace-room or 

 shed, at one end, which is twelve by thirty-three feet. 

 Of course, the length may be increased or diminished as 

 desired, but this width is found to be the most convenient. 



60' - 



F.R. 



w 



w 



' B 



"$:: 



W 



Fig. 20. PLAJ* OF THREE HOUSES COMBINED. Length,60 ft.; width,33ft. 



F, R, Furnace Room, 12x33 ft.; E, J5, BencTies, 4i/<. wide; W, W, Walks, 



2ft. wide; S, S, Smoke-flue for Jieating ; C^t\ Furnace, with Chimney built 



on top of it. 



It will be seen that the three greenhouses are heated by 

 two furnaces, the flue being so disposed under the center 

 benches of the houses as not to cross any of the pathways. 

 This gives, of course, two runs of the flue fco the middle 

 house, and only one run each to the outside houses. This 

 Would, in coldest weather, give a temperature of forty 

 degrees to the outside houses, and sixty or sixty-five 

 degrees to the middle house, which has two runs of flues. 

 This difference in temperature is indispensable in a gen- 

 eral collection of plants, and the neglect of it is, more 

 than anything else, the cause of failure where growers 



