THE FLOWERING FLAMS. 



27 



Examine prepared microscope slides of the above or 

 similar plants under the low power of the compound 

 microscope. Also, if possible, examine a number of 

 photomicrographs of sections of the same plants. (See 

 igs. 4, 5, and 6.) The arrangement of the wood in 

 complete circles about a centrally situated pith or in 

 bundles placed in a circle is characteristic of the Di- 

 cotyledonous Angio- 

 sperms. 



26. The root. Cut 

 across the root of the 

 common Burdock. 

 Compare its structure 

 in cross section with 

 the structure of the 

 stem of the same plant. 

 Are the bundles of 



woody fibers situated the same as in the stem ? The 

 arrangement here observed is the rule for roots of this 

 class. 



27. When the trunk of a tree divides and subdivides 

 until it is lost in the branches, it is said to be deliquescent. 

 When the trunk rises straight up as one shaft, the tree is 

 said to be excurrent. Make a list of all the deciduous 

 trees with which you are acquainted, dividing them into 

 deliquescent and excurrent trees. 



FIG. 6. Part of transverse section of 

 stem of Mimulus ring ens. (X 35.) 



The Monocotyledonous Angiospenns. 



1. Raise seedlings of Indian Corn, Oats, Wheat, and 

 Canary Grass in moist sawdust and in earth. Observe 

 that one leaf only shows itself at first, and is followed 

 later by a second. From this characteristic the Mono- 

 cotyledons are named. Continue this observation until 

 the seedlings have attained considerable 



OK THK 



