io6 NATURE STUDY BY GRADES 



LESSON XXVIII 

 FOREST TREES 



What plants grow in communities? What plants grow 

 solitary? What plants need the most room? Which ones 

 can do with less room ? What is the difference in their shape ? 

 in their trunks or stems ? What trees spread over much space ? 

 What trees are tall and straight and take up little space? 

 What part of a tree is sawed into lumber? Which of these 

 two kinds of trees would make the best lumber? Show 

 pictures of great lumber forests. 



Name the principal trees used in making lumber. How 

 do they grow? The teacher may bring out the facts that 

 lumber trees are tall and straight; that they have small 

 branches, high up the trunk, leaving a long portion of the 

 trunk free from knots and adapted for sawing into boards. 

 They grow close together, making it convenient to erect mills 

 where much lumber can be obtained within a short distance. 



Contrast this with the trunks of the widespreading trees, 

 which divide too low down to admit of sawing long boards 

 from them. Generally such trees do not grow in dense for- 

 ests, but are scattered. 



LESSON XXIX 

 LUMBERING 



Secure a piece of a small tree or limb, about two feet long, 

 and four or five inches in diameter. If it has one or two 

 knots, it will be all the better. Let this represent a log of 

 wood cut to be sawed into lumber. 



Discuss and illustrate with pictures how the great trees 



