502 MAN CONTROLS HIS ENVIRONMENT FOR HEALTH 



by some mischievous boy and then tramped under foot causes 

 dust particles in the air, which may irritate the lungs of a hundred 

 schoolmates. Colds may be spread by spitting in the halls or on the 

 stairways. Do not be the one to do such an unsportsmanlike act. 



Keystone View Co. 



Why might this be considered an ideal high school building ? 



Project. To form a service squad in your school. Make a report 

 on such school conditions as may be remedied by concerted or indi- 

 vidual student action and present it to the class. If conditions 

 warrant it, ask your principal to hold a clean-up week, have a health 

 assembly, or in some other way start public sentiment in the school 

 for better cooperation and a more sanitary school plant. 



Demonstration 10. To show the effect of the use of a duster and 

 of a damp cloth upon bacteria in the schoolroom. 



Expose a dish of sterile agar for a few minutes in a room which is 

 being dusted with a dry cloth or feather duster. Expose another dish 

 of sterile agar in a room which is being dusted with a damp cloth. Cover 

 the two dishes and keep them in a warm place for 24 hours. What is 

 the result ? 



Lunch time and lunches. Lunches should be clean, tasty, and 

 well balanced. In most large schools, lunch rooms are part of the 

 equipment and balanced lunches can be obtained at low cost. 

 Do not make a lunch entirely from cold food, when hot can be 



