338 



GEOLOGY OF THE COMSTOCK LODE. 



for the circuits P C, earth, T. C, tvire, P. C, and are essentially the 

 resistances of the layers of rock surrounding P. C. and T. C. 



Table IX. 



The results of the measurements of electromotive forces between P. C. 

 and I.— X. are contained in Table X. They are given in a way entirely 

 analogous to that adopted for the 500-foot level, and no further explanation 

 is> necessary. Intensities are expressed in electromagnetic units (C. G. S.), 

 electromotive forces in volts. Water was used as an outer liquid. 



Table X. 

 FIRST SERIES. 



SECOND SERIES. 



ilu these cases three consecutive exchanges of the terminals were made, Iheir positions in Noa. 1 aod 3 and in ITos. '2 

 and 4 l)L<iug the same. 



