260 



VEGETATIVE PROPAGATION 



part of the organism 

 may be grafted on to the 

 diseased bone. But, to 

 a large extent, grafting 

 of tissues, bones, and 

 even organs is still in 

 an experimental stage 

 and has not proven suc- 

 cessful in all instances. 

 Natural methods of 

 vegetative propagation. 

 Layering, another 

 method of propagation, 

 SI often occurs without 



Layering is a modification of cutting. It consists in ^ aqqi'qtnnpp nf man 

 bending down a stem and covering it with earth. Deep- man. 



notching or ringing the bark of the part buried usually T n m o n v r> a <? p <5 tVip 

 hastens the rooting of the stem. n V 



branches of a tree or 



brush may bend down until they come in contact with the soil. 

 Sometimes they become covered with soil. If there is sufficient 

 warmth and moisture in the soil, the branches will develop roots. 

 Frequently, after developing roots, they break off from the tree 

 and form an entirely new plant. The raspberry, with its arching 

 stems, illustrates this type 

 of propagation. 



Runners are branches 

 that trail along the ground. 

 Sometimes, the ends or 

 joints of these branches 

 come in direct contact with 

 moist soil. Roots and, 

 finally, a shoot develop at 

 this point, forming a new 



, . . When runners are found in plants, they may be used 



plant. btrawberrieS, as as an easy and rapid method of propagation. 



