orchids: irow to grow tiiem successfully. 79 



oft(m most senously injured by subjcctin;^ thoni to tho troatmont 

 given to others. Many more Dendrobiuius may now go into 

 cooler quarters, but be careful not to take those requiring a warm 

 winter temperature. 



October. 



Cool House. — Temperature, same as hist month. 

 Fire heat will again be necessaiy if the nights get too cold, 

 it being best to have gentle warmth in tho pipes, and ventilation 

 on, than to have the house shut up without the warmth, as such 

 treatment often produces fungus or mildew in the form of spots 

 on the under surface of the foHage of Odontoglossums, and if not 

 wiped off instantly, a permanent mark in the form of a rusty spot 

 is left. With this warmth, refuse tobacco as before recommended, 

 may be used in the troughs on the hot-water pipes. Roller blinds 

 should now only be lowered when the sun is exceptionally strong. 



Intermediate House. — Temperature, same as last month. 



The time has now arrived when water should be given with 

 the greatest care, for I have at times seen plants so shrivelled from 

 drought as to be beyond recovery, while others frequently come 

 under my notice that are suffering from the effects of too much 

 water {see remarks on Resting, jiar/e 50). The roller bhnd will now be 

 rarely needed, and may be taken down when dry and stored away. 

 A fresh supply of dry leaves should be placed over the pipes or 

 under the stages, as previously recommended ; and beware of wood- 

 lice and cockroaches, as they are very troublesome at this season. 



Warm House. — Temperature, day with sun, 75° to SC* ; daij without 

 sun, 70° ; night, 65° to 70° ; morning, 65°. 

 Let damping down now be done with discretion, as the air at 

 this season should be kept somewhat drier, the growing period 

 having passed, and the hardening off attended to. I am not 

 advocating such rigorous treatment as ^H for the Mexican 

 Orchids, but that a much less moist temperature should be given 

 to others, as well as less water at the roots, and air admitted on all 

 suitable occasions, ha\'ing a little fire heat to promote a quick 

 circulation and also a buoyant atmosphere, as bracing as possible. 

 With this a healthful tone is given to the plants and is of material 

 benefit to them throughout the winter months. By this means all 

 intermediate second growth is arrested. 



