744 



C. R. VAN HISE 



flowage of the water through a homogeneous porous medium. 

 In the next chart (Fig. 4) I have supposed water to enter at 

 three points and issue at one ; and I have supposed the flowage 

 from each point of entrance to occur just as if no water were 



Fig. 3. 



entering anywhere else, and therefore the systems of flowage 

 to be superimposed. Of course this is not a real case. Under- 

 ground water does not diverge from a single point and con- 

 verge at another point in independence of the water entering 



