Winter Buds of Buckeye. 37 



What is the use of the cotton among the buds ? Draw the 

 terminal bud. Dissect it. What will such buds on the tree 

 develop into next season ? How many leaves were there 

 on the growth of last year ? What caused the hollow" scars 

 on that and preceding growths ? Of what advantage to the 

 tree is it that these branches are brittle ?* 



What did you learn from the experiment with red ink ? 



Get branches of buckeye which bear between a pair of 

 twigs a fruit stem (peduncle) of the last season, and also 

 a specimen which has a hollow scar between a pair of 

 branches. One specimen may show both conditions. 



EXERCISE 23. 



Winter Buds of Buckeye. Find the leaf scars. Are 

 they opposite or alternate? Draw one showing correctly 

 the markings. Buckeyes have compound leaves of five 

 leaflets. A bundle of fibers runs from each leaflet down 

 the stem (petiole) of the leaf. Does the scar indicate the 

 number of leaflets ? Before deciding this question examine 

 the leaf scars on many kinds of trees. How many pairs of leaf 

 scars do you find on the stem which bore the fruit ? How 

 many on each of the twigs which grew last season ? How 

 many buds ordinarily grow on each twig ? What, one year 

 ago, was in place of the peduncle and the pair of twigs ? 



* Poplar trees are dioecious; i. e. , the staminate and pistillate blossoms are not 

 borne on the same tree. Since the cotton of the seeds is a great nuisance, only 

 the staminate trees are planted for shade trees. It is therefore assumed that the 

 pupils will not be able to get the fruit-bearing branches. When possible, our 

 native cottonwoods, both pistillate and staminate, should be studied. 



