PROTECTING A SPRING 



In this picture are shown the methods used by the Public Health Service in preventing 

 the water in a spring from becoming polluted by surface drainage. A concrete box has been 

 built around the spring and the wooden forms for holding the concrete are just being re- 

 moved. The concrete box will be provided with a water-tight cover. The laborers on the 

 hill above are digging a ditch to pass surface drainage around the spring. 



nated against smallpox. This was made 

 immediately necessary by the appearance 

 of two cases of that disease in the neigh- 

 borhood of the cantonment. Large num- 

 bers of small stands for the sale of food 

 and soft drinks were hastily put up. 

 These were inspected, and all which were 

 being operated in a manner dangerous 

 to health were required to comply with 

 sanitary regulations or cease business. 

 The ditching and draining of the area 

 was rapidly pushed until in many in- 



stances only a small series of pools ex- 

 tending to the headwaters remained. 

 These were oiled until their contents 

 evaporated. In other places this was not 

 practicable and top minnows for the de- 

 struction of larvae were planted. 



Every premises in the rural district was 

 carefully surveyed, and in each case thor- 

 ough instructions were given regarding 

 the installation of sanitary devices for 

 human excreta. On these visits anti- 

 typhoid vaccine was carried along in a 



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