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  Geological, 
  Survey 
  of 
  Louisiana 
  [Sect. 
  

  

  Here 
  the 
  road 
  maps 
  mentioned 
  in 
  our 
  next 
  article 
  would 
  serve 
  

   an 
  excellent 
  purpose, 
  enabling 
  one 
  to 
  locate 
  himself 
  at 
  any 
  time 
  

   with 
  accuracy. 
  

  

  A 
  magnetic 
  survey 
  of 
  a 
  state 
  should 
  include 
  at 
  least 
  one 
  

   observation 
  in 
  every 
  township. 
  The 
  greater 
  the 
  facility 
  with 
  

   which 
  trustworthy 
  observations 
  can 
  be 
  made, 
  so 
  much 
  the 
  less 
  

   expensive 
  and 
  more 
  accurate 
  will 
  be 
  the 
  results. 
  

  

  