CH. X ROSES UNDER GLASS 193 



catch the sun in the morning and afternoon, and 

 not suffer from excess of heat in the middle of the 

 day. I do not propose to enter into any details 

 of structure ; but in a cool house, especially if the 

 Eoses are planted in the soil and not grown in pots, 

 it is advantageous that the whole of the roof should 

 be removable during the summer, when canvas may 

 be substituted for the glass for a short time if 

 necessary till the plants are hardened to exposure ; 

 and in all cases the ventilation should be principally 

 at the top, and means should be provided in tanks 

 and troughs on the hot-water pipes for the evapora- 

 tion of moisture within the house. For early forcing 

 a pit is best, because the plants can be placed nearer 

 the glass and the light, and the pots may be so 

 arranged that they can be lowered to keep them the 

 proper distance from the glass as they grow higher. 

 Something in the nature of an outside blind, which 

 can be pulled up under a ridge on the roof, is a very 

 desirable adjunct to a house where Eoses are grown 

 after the sun has attained its summer strength. 



The simplest form of Eose culture under glass 

 will consist of standards or dwarfs, planted in beds 

 in a cool house where the roof, and indeed as much 

 as possible of the structure, can be entirely removed 

 by the middle of June. The plants will then be 

 subject to natural conditions and treated in the usual 

 manner till about the middle of October, when the 

 roof may be entirely replaced, but plenty of air may 

 still be given on fine days. Many late buds thus 

 sheltered from the damp which would have destroyed 

 them in the open may be preserved in this way, and 

 some of the thin and free-flowering Teas may 

 continue to produce a valuable bloom or two up to 



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