HEALTH AND WELL-BEING 29 



the purity of spring waters ? By use of a diagram show how 

 springs arise. 



10. Where the water supply of a city is drawn from a river 

 into large storage reservoirs, (a) what provision is made for 

 filtering on a large scale ; (6) what means other than filtering 

 is employed to rid the water of suspended matter ; (c) what 

 method is employed on a large scale for the aeration of 



stored waters? 



t 



11. Where there is reason to suspect the purity of a 

 water supply, what wise precaution should be followed in 

 the home to avoid danger of infection from the water ? How 

 may it be determined whether or not there are "germs" 

 in the water supply? How is it learned what particular 

 disease germs are present? 



GENERAL HEALTH PROBLEMS 



1. Name several conditions wholly under the control of 

 an individual that contribute to the public health. Men- 

 tion others, present especially 



in towns, that are not wholly 

 controlled by him. 



2. Describe in a general 

 way how infection occurs. Dis- 

 tinguish between infection and 

 contagion. What relation has 

 one's general state of health to 

 "taking" a disease? What is 



the physiological explanation FlG . 14 .- sunshine as a 



O f thi s ? disinfectant. 



