PROPAGATION. 257 



The next condition to be provided is a warm 

 bed for the eyes to root in, and a cooler, but 

 moist and uniform atmosphere for the tops to 

 grow in. The heat for the bottom is obtained 

 by closing all the doors of the hot-air chamber, 

 which prevents the heat from the pipes from 

 escaping into the house. A good thermometer 

 must be used here, and strict attention paid to 

 the fires, so that the heat may not at any time 

 become too great. The bottom heat may go as 

 high as 70 or 80 with safety, but from 60 to 

 70 should be observed as nearly as may be. 

 The temperature of the house should be kept 

 about ten degrees below the bottom heat. 

 This is- done by regulating the heat from the 

 pipes, and opening the ventilators of the house. 

 As the season advances, this matter will need a 

 good deal of attention. Changes in the weather 

 must be watched for and provided against, and 

 every precaution taken to secure and maintain 

 great uniformity in all the conditions named as 

 necessary to success. 



Now, let us see what takes place in the bed. 

 In a few days the buds will begin to swell, and 

 then growth will begin ; but no roots have yet 

 been formed. After the first start, the motion 

 for a while is scarcely apparent : the cuts are 



