90 LABOKATOEY MANUAL 



Break off a leaf from the stem. Examine the end of 

 the leaf stalk. What do the red dots on the end indi- 

 cate ? Through Avhat part of the stem do liquids pass ? 

 Make a drawing of a cross section of a stem to show 

 the path of liquids. From general observations can 

 you suggest other functions of stems? 



CHAPTER XIV 



FLOWERS AND SEEDS 



Exercise 61. A Typical Flower. 



Object: To learn the parts of a typical flower. 



Apparatus 



Trillium Forceps 



Dissecting microscope Needles 



Scalpel 



Directions: Carefully examine the flower of the 

 trillium. Note the outer circle or whorl of leaf-like 

 parts. How many are there? What is their size and 

 shape ? Each of these parts is called a sepal; together 

 they form the calyx. The second whorl of parts forms 

 the corolla, each separate part being a petal. 



How many petals are there ? How are they arranged 

 on the flower stalk in reference to the sepals? How 

 do they compare in size and number to the sepals? 

 What is the nature of the parts of the third cycle of 

 floral parts just inside of the corolla? These are the 

 stamens. How many are there? How are they 

 arranged? Remove a stamen and note the slender 



