CHAPTER XXV 

 MAN'S IMPROVEMENT OF HIS ENVIRONMENT 



Problems: How may we improve our conditions at home? 

 How may we help improve our conditions at school f 

 How does the community care for the improvement of our environ- 

 ment? 



(a) By the inspection of buildings. 

 (h) By the inspection of food supplies, 

 (c) By the inspection of milk, 

 {d) By the care of water supplies. 

 (e) By the disposal of wastes. 

 (J) By the care of public health. 



Laboratory Suggestions 



Home exercise. How to ventilate my bedroom. 



Demonstration. Effect of the use of a duster and a damp cloth upon 

 bacteria in the schoolroom. 



Home project. A comparison of luncheon dietaries. 



Home project. A sanitary survey of the conditions of my block or an area 

 of my town. 



Demonstration. The bacterial content of milk of various grades and 

 from different sources. 



Demonstration. The bacterial content of distilled water, rain water, tap 

 water, dilute sewage. 



Laboratory exercise. Plotting of curves from board of health tables to show 

 the mortality from certain diseases during certain times of year. 



Project. A study of the work of the local board of health. 



The Purpose of this Chapter. — In the preceding chapters we 

 have traced the lives of both plants and animals within their own 

 environments. We have seen that man, like them, needs a favor- 

 able environment in order to live in comfort and health. It will 

 be the purpose of the following pages first to show how we as indi- 

 viduals may improve our home environment, and second, to see 



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