ve ROSES UNDER GLASS 199 
temperature should not exceed 75° by day and 50° 
at night. A further slight rise from sun heat will 
do no harm, nor a small decrease when the weather 
outside is very dull and cold. 
Next to temperature, the most important part is 
moisture. The aim should be to keep the plants 
and atmosphere sufficiently damp by syringing and 
wetting of exposed surfaces in bright weather to 
avoid red spider and thrips, and yet not so damp as 
to bring on mildew; two syringings a day may be 
taken as a general rule, three in dry hot sunshine as 
the season advances, and in very dull damp weather 
only one. Some fresh air is most desirable; if the 
weather be at all mild, the top ventilators may be 
opened a little, but not on the windward side and 
only for a short time—mind they are not forgotten ; 
and do not open the house at all to let in a wind 
which is really cold, or in frost or fog. Watch for 
all insects, especially aphis—try how soon you can 
get the first one, and perhaps it will also be the last. 
Clear liquid manure may occasionally be used for 
the feeding ; as the plants increase in vigour, do not 
make the food stronger, but give it gradually a little 
oftener, with always pure rain-water, which should 
never be below the temperature of the house, be- 
tween each dose. Very strong ammoniacal liquid 
manure is kept by some growers in troughs on the 
hot-water pipes, and it is generally believed that the 
plants benefit through their leaves from the gases 
thus diffused in the air. 
For a succession, the simplest plan is to bring in 
fresh plants during the first few weeks, if there is 
only one house. As the Tea Roses, and those that 
are sensitive to wet, begin to show the petals, some 
