120 LABORATORY LESSONS IN GENERAL SCIENCE 



3. What relation is likely to exist between any chances of 

 advancement in position for a wage earner, and his educa- 

 tional and industrial preparation for his work? What 

 conditions may overrule this natural association? Name 



FIG. 55. When work hours are over. 



some factors, wholly apart from the efficiency of the individ- 

 ual worker, that enter into the computation determining 

 the pay that can be given employees in an industrial concern. 



4. How large a part has any one person in the making of 

 a shoe, or the making of an engine? Of what character is 

 the work of a shop or factory operative generally ? What is 

 the effect upon a person mentally and physically who is 

 engaged day after day as an attendant upon a machine ? 

 What different results may follow the use of machines by 



