crxTAdi-: 



103 



where there is an epidermis with primarj' tissue beneath. 

 The change which leads to the formation of adventitious 

 buds always follows an unusual condition of plant growth 



FIG. 92— ODD WAYS OF STARTING CUTTINGS 



1. Short geranium cutting rooted. 2. Cactus cutting rooted. Both cuttings 

 fastened to toothpicks. 



such as insufficient assimilation of elaborated food by the 

 plant or an injury of some kind. 



Thus adventitious buds may be called emergency buds, 

 because they seek to preserve the pla^t when endangered. 

 This orovision of nature has given rise to many of the 



