30 ENVIRONMENT OF PLANTS AND ANIMALS 



Problem (i : To make a graph to show how much fluid I take 

 into my body in a day. 



Method and Observations. — Make a careful estimate of the 

 amount of water drunk by glasses or cups and note hours when 

 you take it. Note also milk, coffee, tea, soda, etc., taken. Make 

 a graph to show when and how much fluid passes into the body in 

 24 hours. 



Is this graph a continuous curve? Explain. 



NOTE. — Ability to make and to understand graphs is something that every well- 

 educated girl and boy should acquire. The above exercises are suggested as easy 

 data for making two different graphs, each of which will have a different ap- 

 pearance. Teachers are expected to give the class data from which other graphs 

 may be constructed. 



Problem 7 : May environment influence public health? 



Method and Observations. — Study the following table. Look 

 up the location of each of the countries and cities. Find out all 

 you can about their climate, housing conditions, location and con- 

 dition of water supply, etc. 



Death Rate per 10,000 Population, Pneumonia and Bronchitis, 

 Five-Year Period 1896-1900 



England and Wales 22.70 



Scotland 27.40 



Stockholm 26.70 



London 31.20 



Berlin 16.10 



Vienna 39.70 



Christiania 21.30 



Boston 30.60 



Chicago . . 24.20 



Philadelphia 25.10 



New York city 36.60 



Might any factors, such as climate, slums, overcrowding, etc., 

 have an effect upon the death rate? 



Conclusion. — What factors may influence the death rate? 



