126 
JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
away both side and top ventilators should remain open night and 
day for at least a fortnight to prepare the plants for the exposure, 
and advantage should be taken of a dull, still warm morning for 
this change, as strong sun or wind is hurtful to the foliage of 
Roses exposed for the first few days. 
Thus it will be seen that in a house such as I have endea- 
voured to describe there will be ample means of ventilation, which 
will go a long way towards warding off the various pests which, 
whether under glass or in the open air, but especially under glass, 
the Rose-grower has to encounter. But while sufficient ventila- 
tion is most essential, there can be no question that it may be 
overdone in the spring and winter months. There is more 
danger from this in the spring. At this season Roses should not 
be exposed to a keen wind or to sharp currents of air. Mr. 
Foster Melliar's remarks on this point are deserving of special 
attention. As he says in his " Book of the Rose," page 175 : 
" It is far better to give no air at all than to open the ventilators 
to an icy wind. Still Roses must have air, and there will be few 
days when it cannot be admitted on the lee side for an hour, or 
even less." 
It may be thought that I have commenced my lecture from 
the wrong end, by explaining the time for the removal of the 
lights or sashes before having mentioned the introduction of the 
Rose plants into the house ; but my pen ran away with me, and 
I will now return to the subject of equal importance to the 
structure — viz. the Roses. 
As no staging will be required in the house I have described, 
there will, as I have bc^foro said, be a centre l)ed, and a border all 
round, in which maybe planted about eighty Rose trees ; but if 
plants in pots arc used, one-third more will be required. If the 
Roses arc to be planted in the ground, this operation should 
be carried out not later than the first week in November, 
giving them a good watering with tepid water after planting, 
and a shght syringing every morning. Do not admit much 
or any ventilation for a fortnight, except during bright sun- 
shine, when a thick shading is necessary to prevent the sun 
from shrivelling the young wood. This precaution will not be 
necessary at this season of the year after the plants have become 
established. At the expiration of a fortniglit or three weeks the 
top ventilators may remain open night and day except during 
