X ROSES UNDER GLASS 199 



temperature should not exceed 75° by day and 50° 

 at night. A further shght 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 Eoses, and those that 

 are sensitive to wet, begin to show the petals, some 



