THE FORCING OF ROSES. 9 



be avoided, and it is generally a good thing, in a rose 

 house, to have the ventilators arranged with this idea. 

 If there is but a single row, they should be on the side 

 from which the prevailing winds come, if hinged at the 

 bottom, and on the opposite side if hinged at the top. 



While either extreme of temperature should be 

 guarded against, it is quite as desirable to give the plants 

 fresh air, at least for a short time, each day. In hot 

 weather give all of the air possible, and leave on some 

 even at night, at the ridge. Exposing the plants to 

 great extremes of temperature is especially likely to 

 bring on an attack of the mildew, and if it should ap- 

 pear, as it often does, without apparent cause, the house 

 should be kept somewhat closer than usual for a few 

 days, and after syringing them the plants should be 

 dusted over with sulphur. As the weather becomes cool 

 in September, it is well to furnish a little artificial heat, 

 to keep the temperature of the house above fifty-five 

 degrees. One or two steam pipes, or a low fire in the 

 hot water heater, will secure this and often prevent a 

 serious check of the plants. With this care, firm, short- 

 jointed wood should be secured, which will give an 

 abundance of bloom. While fifty-eight degrees is given 

 as desirable for a rose house, in order to secure the best 

 results, with the various sorts some little deviation is 

 advisable. The Meteor, among other kinds, needs a 

 few degrees higher than that, while the Perle, Bride 

 and Mermet, and others of the old varieties, should 

 have a temperature a little lower than fifty-eight degrees, 

 if the plants have been properly grown. 



It will generally be found best to do the watering 

 early in the morning, and, on the warm, bright days 

 when syringing is necessary, it should be done early 

 enough so that the plants will dry off before night. In 

 ventilating, care should be taken to avoid extremes, and 

 it is best to give a little air as soon as the sun begins to 



