OBSERVATIONAL LESSON XI 



111 







Kecord : 



(a) The width of your 



log 

 (6) The thickness of 



its 



Bark 



Heart wood 



Sap wood 



(c) The number of 

 rings in the wood, 

 and calculate the age 

 of the trunk or limb 

 from which your log 

 was cut 



(d) An % y other mark- 

 ings or details of 

 structure in the wood 



Carefully 

 make : 

 A large dia- 

 gram show- 

 ing all the 

 parts of the 

 log which 

 you have 

 described 

 and label 

 them. If 

 time does 

 not allow 

 you to fill 

 in the de- 

 tails of the 

 whole circle 

 finish a 

 quarter of 

 it 



FIGURE 109. Oak Bark. 



SUGGESTIONS FOR FURTHER WORK 



Compare the oak with a piece of elder stem, two or three inches 

 thick ; and with branches of beech, ash and willow. Specimens of 

 various woods may be collected, cut (1) across, (2) lengthwise, 

 (3) tangentially, and then mounted. 



