NATUBE-STUDY LESSONS. 85] 



E. The Leaves. 



14. (a) How many leaves has the trillium ? 

 (jb) How are they arranged on the stem ? 



The arrangement of leaves in a ring round a stem is called a whorl. 

 (c) On what part of the stem are they situated ? 



15. Observe trilliums forcing their way up through the 

 ground and withered leaves. 



16. Describe the modification of the form of the leaves 

 which enables them to come up through the ground. 



17. (a) Hold a leaf up to the light, and looking 



through it describe its appearance. 



The broad part of the leaf is the dlade. The strands or lines are called 

 veins and a leaf-blade whose veins are arranged in this net-vifork form is said 

 to be net-veiiud. 



{b) Draw a leaf. 



18. (a) To discover the relation of plants to light 



compare potato stems grown in the dim 

 light or darkness of a cellar with those 

 grown in the light. 

 (b) Infer why the spring is better suited than 

 midsummer to the overground work of 

 the trillium and other "spring flowers." 



P, The Flower. 



19. What is the color of the flower? 



20. What other colored trilliums have you observed? 



21. In what respects were they similar to, and in what 

 respects different from, those first described ? 



22. Which color is the prevailing one in trilliums ? 



23. Is every part of the flower of the same color? 



