NATURE-STUDY LESSONS. 145 



D. The Back. 



15. {a) Describe the remaining part of the chair. 

 {b) What is its use ? 



(<;) Examine the backs of different chairs and 

 describe any differences in shape and 

 height you have noticed. 



[d) In what different ways are the backs placed 

 with regard to the seat .' 



{e) Which position is the most common ? 



(/)Why? 



16. (ct) Describe any other parts than those above 



mentioned which you have noticed on 

 some chairs. 

 {b) What purpose is served by each of these ? 



17. (a) What other objects take the place of chairs ? 

 {b) What is the main difference between each of 



these and a common chair ? 



18. Make a drawing of a common chair showing all 

 the parts. 



XXXIX.-A RIVER VALLEY. 



1. Observe the effect of rain : — 



(a) When falling on a nearly level area. 



(b) When falling on a hill. 



2. In each case, what evidence is there that rain can 

 alter the form of the land ? 



3. Observe in what kind of soil the deepest runnels 

 are made by the streams of water. 



4. What becomes of the earth and stones washed 

 away by the water ? 



5. What kinds of materials are carried farthest by 

 the water? What kinds are carried the shortest dis- 

 tances? 



