NATURE-STUDY LES&OffS. .10] 



(b) Look at older stems for similar circular 

 markings. 



26. (a) How often in a year are buds produced ? 



(J?) Hence, infer the number of such circular mark- 

 ings that will be found in one year's growth 

 of any stem. 



27. Mark off one year's growth ; two years' growth i 

 three years' growth, etc., on a twig. 



28. Make a drawing of a twig two years old, showing 

 both leaf markings and scale markings ; also the posi- 

 tions of the buds. 



29. Examine the twigs of the maple and elm for leaf 

 markings and scale markings, and determine the age of 

 the twig. 



30. {a) Examine the growths of separate years on 



your horse-chestnut branch, and determine 

 whether they are all of the same length. 

 {b) If the lengths are not the same infer what 

 influences may have caused the difference. 



F. Fruit-Scars. 



31. {a) Examine the branches of the horse-chestnut 



in the fall when the fruit is dropping or 



being pulled off". 

 (J?) Describe the mark made by the severance of 



the fruit-stem from the branch. 

 (c) How can you distinguish these marks from 



those made by the falling of a leaf? 



32. Make a drawing of a branch of the horse-chestnut, 

 four years old, showing the buds and the three different 

 kinds of markings. 



