340 



GEOLOGY OF TOE COMSTOCK LODE. 



calculated, that of No. I. (500-foot level) being zero. The values obtained 



from the different series are designated by indices (e', e" , e'", e"', e", e^'). e^ 



is the mean of the first three, Co of the last three ; and e the mean of all the 



series. 



Table XI. 



iTo facilitate the coDstructiou of Fig. 28, current numbers h.ave been given to tlie points on ibe 400-foot level. The new 

 numbers are given with the original ones. 



Table XII. has been prepared to show the character of e as a function 

 of distance (see page .'M2). In it e has the same signification as in the 

 preceding table. Under distance, however, is given the length in feet of 

 the imaginary line joining Point I. with the point to which the datum refers. 

 The data included under hearing also refer to this line. Current numbers 

 have been given to the points on the 400-foot level. (See "Points," Table 

 XI.) 



