STEMS 



113 



Node. 



internode. 

 Node..... 



107. STEMS 

 Object. To discover the parts of a typical stem. 



Apparatus. Portions of several different kinds of stems, such 

 as bamboo, Indian corn, maple, lilac, ailanthus, or beech. 



Method. Select the portion of stem included between 

 the leaf scars of any two consecutive leaves. 



Study this region carefully and make out such facts as 

 color, texture, surface, covering, and appendages, such as 

 hairs, prickles, etc., if 

 they occur. Find a 

 node (joint). What 

 structures are found 

 at a node ? Do you 

 find these organs 

 elsewhere than at 

 the nodes ? (See but- 

 ternut, cherry, and 

 bitternut.) Measure 

 the length of an 

 internode (space be- 

 tween two consecu- FlQ 

 tive nodes). Do the 



internodes vary in length or are they about the same in 

 length? 



Now select another part of the same branch and examine 

 the same portion. Do the nodes and internodes sufficiently 

 resemble each other as to be recognized as being taken from 

 the same plant? 



Of how many internodes does the branch you have con- 

 sist? 



Study each of the other branches as you did the first. 



EXP. EOT. 8 



..Node 



Node 



-.Mode 



