50 



THE PRINCIPLES OF FLORICULTURE 



to drafts and consequent chilling. 

 Ventilation is therefore more ideal, 

 and plant growth is much more 

 healthful. This is particularly 

 true in rose houses, where a 

 sudden change of temperature 

 about the plants will cause an 

 abundance of mildew to appear 

 quickly. In larger houses, plants 

 have conditions more nearly like 

 those outside. Plants have grown 

 equally well a considerable dis- 

 tance from the glass, as when 

 close to it, and in the house of 

 greater elevation there is plenty 

 of head room for development of 

 blooms. This is particularly true 

 in some modern sweet pea houses, 

 where the side walls are eight feet 

 high. 



There are some conservative 

 growers who still believe that the 

 tendency towards large houses has 

 been overdone. The writer be- 

 lieves, however, from his observa- 

 tion and experience, that the 

 moderately large house is the 

 most satisfactory from a com- 

 mercial view-point. Extremely 

 large houses may come into per- 

 manent favor at a later date, 

 but their value has not as yet 

 been fullv demonstrated. 



