168 THE INVISIBLE WOKLD 



ways, Surface water. This is shown by authentic 

 facts like the following: 



A single soldier, in a barrack situated on a cer- 

 tain stream, has the typhoid fever. Twenty-eight 

 miles below the barrack is a hospital supplied with 

 water from the stream. By using the water forty 

 persons in the hospital take the fever. 



On another stream is a case of the fever. 

 Twenty-five miles below, water is taken from the 

 stream to supply a village. In that village 150 

 persons are stricken with the fever. 



The operatives in a mill use a water closet over 

 a brook. One of the operatives has the typhoid 

 fever. Seven miles below the mill, a milkman 

 washes his cans in the water of that brook. In 

 every family using that milk the fever breaks out, 

 fifty families, 146 victims. 



A single patient dies with the fever in a farm- 

 house near a brook. The contents of the water 

 closet, into which the excreta are deposited, are 

 spread on a field adjoining the brook. In the vil- 

 lage below, which takes its water supply from that 

 stream, 2035 people have the fever; 104 die. 



In Syracuse, N. Y., after a severe drouth, falls 

 a heavy shower. Surface water finds its way into 

 a certain well. In every family using water from 

 this well the typhoid fever breaks out. Seventeen 

 cases prove fatal. 



In a part of Springfield, Mass., typhoid fever 

 becomes epidemic. The Board of Health trace 

 every case to a certain milk route. Specimens of 



