116 NATURE-STUDY LESSONS. 



21. Which do you consider the most beautiful grains? 



22. Try to imitate them in drawings. 



23. («) Cut the different woods with a knife or chisel. 

 (b) Which are hard to cut and to work ? 



(/) Which are easy to cut and to work ? 



24. (a) PoHsh one of the surfaces by rubbing the slabs 



with fine sandpaper. 

 {b) Compare the various kinds of wood as to their 

 adaptation for taking a polish. 



25. From your observations, suggest uses for the differ- 

 ent kinds of wood and discover why they are thus used. 



26. Make a collection of different kinds of wood and 

 label each specimen with the time and place of collection. 



XXX.-LEAVES. 

 A. Relation to Sunlight. 



1. Collect leify twigs of the maple, elm and horse- 

 chestnut. 



2. (a) On what part of the plant were these leaves 



found ? 

 {S) Where were they growing, with relation to the 



ground ? 

 {c) What is their color ? 



3. (a) Examine grass-leaves that have been covered 



by a board for a few days. 

 (J)) What is their color ? 



4. (a) Place a house plant (geranium) in darkness for 



eight or ten days. 

 (b) Observe the changes that take place. 



5. From these observations, infer the relation of the 

 green color of the leaf to sunlight. 



6. Compare the form of leaves with that of the stem 

 of the plant. 



