192 



FIRST TEAR SCIENCE 



determined by counting these rings. No such layer is 

 found in the monocotyledonous stems. Grafting (Fig. 



89) and budding (Figs. 

 90 and 91) are processes 

 of bringing the cambium 

 layers of two trees of 

 similar kinds in contact 

 and keeping them pro- 

 tected so that they will 

 grow together. In this 

 way, many of our finest 

 species of fruit are propagated. 



Experiment 98. Examine several growing stems or twigs which 

 have buds upon them and notice how the buds are arranged. Is the 

 arrangement the same in all? If these buds grew into twigs or 

 leaves, would they shade each other ? Is there a bud at the end of 

 the twig or stem ? 



Fig. 89. 



Fig. 90. 



Fig. 91. 



If we examine the tip of a growing stem or twig, we 

 shall find a bud. In most of the trees and shrubs of 

 temperate regions a terminal bud is formed at the close of 



