NATURE-STUDY LESSONS. 83 



((^*) In a dry season, why may the clover keep 

 green when the grass looks parched and 

 sere ? 



22. (a) Take up some clover roots very carefully. 

 (d) Examine them for little warts or nodules. 



These warty-like growths are the product of a minute fungus or bacterium, 

 too small to be seen without a compound microscope. They are said to be 

 able to store up free nitrogen, a very important part of plant food. 



23. Why do farmers sometimes raise rich crops of 

 clover merely to plow it into the ground ? 



XXIII.-THE TRILLIUM. 



A. The Home of the Trillium. 



Visit rich woods and observe the trillium in its home, 



1. Describe the place where you found trilliums grow- 

 ing, as to shade, soil and plant companions. 



2. Describe the position of the plant-stem in relation 

 to the ground. 



Plants which grow upright are said to be erect. 



B. Parts of the Plant. 



Carefully remove the soil from the roots and lift the whole plant. 



3. Examine and describe the different parts which 

 make the plant. 



C. Root and Bootstock. 



4. (a) Describe the underground parts. 

 (d) Make a drawing of these parts. 



(c) How were these parts protected during the 

 winter? 



5. Compare the underground parts of the trillium with 

 those of the buttercup, clover and hepatica. 



6. Of what uses are the roots of the trillium to the 

 plant ? 



