COMMUNITY ACTIVITIES AND HEALTH 



357 



various lines of control and activity involved will sjive us an 

 idea of how far-reaching is our dependence upon our environ- 

 ment and upon one another. In addition to the inspection of 

 slaughterhouses we regulate the cleaning of glasses in which 

 soft drinks are sold, the presence of drinking-cups in public 

 places, the wrapping of bread before it leaves the bakery, and 

 the disposal of garbage and ashes. 



Many diseases are subjected to quarantine and placarding. 

 There are provisions for supplying vaccines, serums, etc., through 



Fig. 165. Pasteurizing milk at home 



A double boiler or a simple steam cooker can be used for sterilizing the baby's milk 



as well as for other purposes. With a glass thermometer and a clock to help, one 



can soon learn to *ise this valuable and inexpensive form of health insurance 



public laboratories, and for supervising the manufacture and 

 sale of such products for profit. There are official laboratories 

 for making accurate examination of blood and other specimens 

 obtained from patients for the purpose of diagnosis. Provision 

 is made for inspection of dwellings, schools, factories, and other 

 places where people live or assemble, in order to determine the 

 sanitary conditions ; for excluding sick people from schools, 

 theaters, etc. ; for supplying vaccination where needed : for dis- 

 infecting discharges from the bodies of sick people ; and for 

 disinfecting premises that have been infected. In some cities, 



