The Culture of Greenhouse Orchids 



been said ; if warm and sunny, the aspect should 

 be south or west. There is an alternatiYe, however. 

 Such a house may be built on each side of a wall 

 running north and south. In that case, shady species 

 would be grown in the one facing eastwards ; sunny 

 species in the one facing westward. 



A convenient length is 30 feet ; but if it be 

 desired to have cool, warm, and hot species under 

 one roof, the building may be any length, divided 

 into spaces, 25 or 30 feet each, by glass partitions. 



It should have only one door, opening into the 

 cool department. Thus the hottest, occupied by 

 Dendrobes, etc., which would be furthest from the 

 entrance, would have the advantage of a closed 

 end, which proves to be very valuable. 



The height should be 12 feet from the floor to 

 the under side of the ridge ; width 15 feet, inside 

 measurement. The back rafters then would be 6 feet 

 6 inches long ; front ditto, 12 feet 6 inches long. 



The front sash, 2 feet 9 inches in height, should 

 not open. 



Ventilators should be provided on each side the 

 roof, all along, about 16 inches in depth, so that 

 one set may be opened whatever the direction of 

 the wind. The bottom ventilators, on the front 

 only, 9 inches high by 18 inches long, should be 

 beneath the stage. I find it useful to cover these 



2o 



