﻿352 
  

  

  W. 
  F. 
  FISKE. 
  

  

  that 
  the 
  ratio 
  between 
  the 
  sexes 
  in 
  the 
  catch 
  would 
  be 
  an 
  index 
  to 
  the 
  ratio 
  actually 
  

   existing 
  between 
  all 
  flies 
  in 
  the 
  locality 
  or 
  district 
  where 
  the 
  catch 
  was 
  made. 
  The 
  

   deduction 
  is 
  logical 
  from 
  every 
  point 
  of 
  view 
  

  

  if) 
  

  

  

  

  .*.*• 
  

  

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  u 
  

  

  

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