58 



Our Surroundings 



and is then called a mineral water. In a certain section in South 

 Dakota there are many wells of this kind, from some of which 

 the water spouts to great heights in large quantities. In the wells 

 at Calais, France, the water comes through the rocks from a 

 very distant source in England. In reaching Calais, it passes 

 through porous rock layers under the English Channel. 



Sewage Disposal. The disposal of sewage is one of the 

 most important problems of every community. The accumulation 



Brown Brothers. 



AN ARTESIAN WELL 



The pressure of water coming from a higher level and imprisoned between rock layers 

 underground makes this well flow. 



of human waste matter is one of the most serious dangers 

 to health. The germs of typhoid fever, dysentery, and cholera, 

 are given off in the waste from the bodies of people who 

 have been ill with these diseases. If care is not taken in dis- 

 posing of these body wastes, the germs may be carried by food 

 or water to other people who in turn may spread the diseases. 

 It is claimed that if all human wastes were properly disposed of, 



