SCHOOL HYGIENE 



433 



number of cubic feet of air that enter the room each second ; 

 then find it for each minute. Multiply the number of pupils 

 in the class by thirty, which has been set as the standard num- 

 ber of cubic feet that should be furnished each pupil per minute. 

 How does the amount of air entering the room compare with 

 this product? 



2. Air currents. Light a piece of touch paper or a joss stick 

 and hold in various parts of the room to determine the direction 

 and strength of the air currents. Make a diagram of the room 

 on the board and indicate the direction of the currents by means 

 of arrows. 



3. Temperature. Place a thermometer in different parts 

 of the room and find the temperature. Try on several days. 

 Compare with the standard of 68. 



4. Humidity. Test the humidity as explained in Demon- 

 stration 8, page 25. Compare with the standard of 50 to 60. 

 Find the humidity outdoors. 



5. Which of the four essentials of venti- 

 lation are provided in the schoolroom? 

 Which are lacking ? How may the deficiency 

 be remedied? 



Sanitary drinking fountains. The 



common drinking cup should be abolished 

 from every school. It is one means by 

 which such diseases as tuberculosis, diph- 

 theria, mumps, pneumonia, and other 

 common infectious diseases are trans- 

 mitted. Even well children may serve as 

 carriers of disease germs in their mouth, 

 so that the common drinking cup is a 

 public nuisance and a source of danger 

 wherever found. An individual drinking 

 cup may be made out of a piece of clean 

 paper as shown in figure 154. With the many types of 

 drinking fountains now available, there is no excuse for 

 allowing the public cup to be used any longer. Even where 



2 F 



FIG. 172. Fountain 

 faucet. 



