﻿and 
  the 
  Constitution 
  of 
  the 
  Atom. 
  

   Table 
  VII. 
  

  

  317 
  

  

  a. 
  

  

  Zr 
  (N 
  = 
  40). 
  

  

  Hg 
  (N=80). 
  

  

  K 
  

  

  I'o4xi0~ 
  cm 
  - 
  

  

  0-63xl0~ 
  l0 
  cm. 
  

  

  2-82 
  „ 
  

  

  3-18 
  

  

  8-J0 
  

  

  L 
  

  

  1 
  

  

  M 
  

  

  6-08 
  

   776 
  

   25-4 
  

  

  Fie. 
  1. 
  

  

  I 
  am 
  far 
  from 
  claiming 
  that 
  the 
  theoretical 
  interpretation 
  

   of 
  the 
  L- 
  and 
  M-series 
  given 
  in 
  this 
  paper 
  can 
  be 
  considered 
  

   as 
  proved. 
  As 
  I 
  have 
  already 
  stated, 
  we 
  must 
  be 
  cautious 
  

   in 
  building 
  too 
  much 
  on 
  a 
  numerical 
  agreement 
  ; 
  but 
  if 
  

   at 
  all 
  we 
  shall 
  be 
  able 
  to 
  proceed 
  further 
  in 
  the 
  direction 
  

   pointed 
  out 
  by 
  Bohr, 
  I 
  think 
  we 
  can 
  hardly 
  avoid 
  the 
  

   assumption 
  that 
  systems 
  of 
  electrons 
  exist 
  in 
  the 
  normal 
  atom 
  

   with 
  quant 
  numbers 
  greater 
  than 
  1 
  . 
  

  

  So 
  long 
  as 
  we 
  do 
  not 
  know 
  all 
  the 
  forces 
  which 
  are 
  

   engaged 
  in 
  forming 
  the 
  stability 
  of 
  the 
  atoms, 
  we 
  have 
  more 
  

   or 
  less 
  to 
  grope 
  in 
  the 
  darkness 
  and 
  feel 
  our 
  way 
  forward. 
  

   The 
  test 
  of 
  the 
  correctness 
  of 
  the 
  previous 
  theory 
  will 
  be 
  

   whether 
  it 
  is 
  in 
  accordance 
  with 
  observation. 
  At 
  any 
  rate, 
  

   I 
  hope 
  the 
  attempt 
  made 
  to 
  elucidate 
  the 
  laws 
  governing 
  the 
  

   X-ray 
  spectra 
  may 
  prove 
  to 
  be 
  of 
  importance 
  as 
  a 
  guidance 
  

   in 
  experimental 
  research. 
  

  

  