Vol. 6$.-\ 



THE MOTION OF SUB-SUEFACE WATER. 



93 



the other, nor with the discharges of pure water at corresponding 

 pressures. 



As shown in the appended diagram (fig. 1), I found that the 

 resulting effluent of a strong brine was, at first, almost entirely 



d.a 



rig. 1. 



Number of experiments. 











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Number of experiments. 

 Density of solution before percolation. 

 Density of effluent after percolation... 



015 



M 0-10- 



0-05 



0-00 

 005 

 0-10 

 015 J 



Diagrams shewing 



the variation's in density of brine 



flowing through a block 



of Bath Weatherstone 



under various pressures. 



>^=f=^ Number of experiments 



cleared of all the salt in the solution ; but later, on using a weaker 

 brine, I found that the effluent was a much stronger brine than the 

 inflowing solution, deriving its salt from the pores of the rock. 

 I experienced considerable difficulty in removing the salt from the 

 pores, hot water and long-continued soaking failing to eliminate 



