574 



A TREATISE ON METAMORPHISM. 



different kinds of lines the vertical components of the flowage of the water 

 which enters at each place independently of the water that enters at other 

 places. (Fig. 10.) In the figure we have a series of intersecting lines 

 representing the vertical components of movement. 



It is not supposed that water actually follows paths similar to those 

 represented by the figure, for there is mutual interference of the water 



Fig. 10. — Idea] vertical section of the flow, through a homogeneous medium, of ground water entering at three points 

 and issuing at a single point, each system of flow being independent of the others. 



entering at the various points. As a result of this the water entering the 

 opening nearest the exit would take a more direct course than the average 

 of that platted; but, as a consequence of this, the water from the next 

 opening up the slope would take a more indirect course, on the average, 

 than that platted, and so on. The total result would be to give an average 

 course for the water which may be represented by combining the inde- 



