PROPAGATION BY MEANS OF CUTTINGS 



83 





(usually the latter) and 

 also for grafts of rhodo- 

 dendrons. (See Chapter 

 VI.) 



In all the above appli- 

 ances, heat is obtained 

 from the sun or from the 

 bench-pipes or flues of a 

 greenhouse. There are 

 various contrivances in 

 which the heat is applied 

 locally, for the purpose 

 of securing greater or 



more uniform warmth. One of the simplest and best of these 

 is the propagating-oven shown in Fig. 82. It is a glass-covered 

 box about 2 feet deep, with a tray of water beneath the earth, 

 and is heated with a lamp. Similar but somewhat complicated 

 apparatus has been used in times past, but with the more de- 



FIG. 82. Simple propagating-oven. 



FIG. 83. Barnard's propagating-tank. 



pendable heat of steam or hot-water pipes, the old forms are 

 likely to pass out and not need description here. Persons who 



