20 How TO Grow Cut Flowers. 



for rose houses, and you will always have a system that 

 will be the best possible preventive of mildew, so far 

 as ventilating is concerned, while both openings can 

 be used to advantage through the heated term. This of 

 course necessitates two lines of shafting and a double 

 apparatus for lifting the two lines of ventilators. For 

 carnations I would advise continuous ventilators three 

 feet in width, the south one to open at the ridge, the 

 north one to be hung to the ridge. These, with wall 

 ventilation on either side will give a fine circulatioa 

 of air. 



Fig. 15. 



For summer work in houses adapted to the growth 

 of cut flowers, I consider wall ventilation indispensa- 

 ble, and for this reason would never join houses used 



