OH. 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 
Roses 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 Roses are grown 
after the sun has attained its summer strength. 
The simplest form of Rose 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 
O 
