REFERENCES 91 



assigned to some member of the class "whose father has one, as a 

 special 'lesson. A drawing of the parts on the blackboard by this 

 pupil should be expected. But no discussion about the engine in its 

 absence is so valuable as an explanation of it while it is before the 

 class. 



2. If possible procure a telephone outfit and explain its construc- 

 tion. 



3. Make a model of a macadamized road. This can be done on a 

 board placed on the desk. Place some clay on the board for the bed. 

 Upon the clay arrange different sized stones in layers. On top put a 

 dressing of sand. It can readily be explained how the large stones in 



GRAIN ELEVATORS. 

 A convenience in the Wheat Belt. 



the bottom prevent the rise of water from below and thus keep the 

 road dry and hard. Sprinkle some water on the completed model. 

 In a short time pull apart a section of it. Note the absence of water 

 between the large stones. 



4. Make a model " split-log drag " from the description given. Ex- 

 plain its operation on the model road. 



REFERENCES 



Constructive Rural Sociology. Gillette. 

 The Farmstead. Roberts. 

 Cyclopedia of American Agriculture. Bailey. 

 Country Life. The Annals, March, 1912. 



