viii SUGGESTIONS TO TEACHERS 



perience and laboratory work, and from them to draw out the 

 principles of science involved. 



To illustrate: In considering the properties of matter in a 

 metal like copper, present first the uses of copper; it is used, 

 for instance, in the manufacture of sheet metal and wire. 

 To be used as sheet metal, it must be capable of " being 

 worked/' that is, hammered into sheets it must be malleable. 

 The same reasoning applies to its use as wire; it must be 

 capable of being " drawn out " it must be ductile. As Walter 

 Dill Scott says in " Influencing Men in Business". "Water is 

 not adequately described by stating that it is composed of two 

 parts of hydrogen to one of oxygen. The important thing 

 about water is the uses which may be made of it." 



This method will be found to be far more effective in teach- 

 ing vocational school pupils than that of presenting the 

 principle first and the illustrative practice afterwards. 



