220 



AGRICULTURE. 



Many other examples of asexual reproduction 

 may be found as, rootstocks, tubers, bulbs, etc. 



Bud propagation may be carried on by four dif- 

 ferent processes : cutting, budding, grafting, and 

 layering, according to (i) the number of buds 

 used, (2) the condition of the material, and (3) 

 the season of the year in which the work is done, 

 as is shown by the following scheme : 



I. Cutting. 



This process consists in taking a leaf, a por- 

 tion of a stem, or of a root, and placing it in such 

 conditions that adventitious J roots are formed, 

 and thus it becomes a new plant. 



i. Green Wood Cuttings are made from the 

 green parts of a growing plant. To secure the 

 best results, the cuttings should be taken from a 

 well-matured branch of a vigorous, healthy plant. 



