﻿160 
  IV 
  AR 
  TRAGARDH. 
  

  

  It 
  is 
  of 
  course 
  impossible 
  to 
  draw 
  any 
  conclusions 
  from 
  these 
  data 
  as 
  to 
  

   what 
  is 
  likely 
  to 
  happen 
  during 
  other 
  outbreaks, 
  among 
  other 
  things, 
  because 
  we 
  

   have 
  no 
  data 
  regarding 
  the 
  parasites 
  of 
  the 
  eggs 
  and 
  the 
  younger 
  larval 
  stages 
  ; 
  

   but 
  if 
  other 
  outbreaks 
  are 
  studied 
  in 
  the 
  same 
  way, 
  it 
  seems 
  likely 
  that 
  we 
  shall 
  

   by 
  degrees 
  be 
  able 
  to 
  prognosticate 
  after 
  the 
  first 
  year 
  the 
  fate 
  of 
  forests 
  attacked 
  

   by 
  Bupalus. 
  

  

  During 
  such 
  investigations, 
  as 
  well 
  as 
  others 
  when 
  special 
  attention 
  is 
  paid 
  to 
  

   the 
  influence 
  of 
  the 
  attack 
  on 
  the 
  health 
  of 
  the 
  trees, 
  I 
  venture 
  to 
  think 
  that 
  the 
  use 
  

   of 
  experimental 
  plots 
  as 
  outlined 
  above 
  will 
  be 
  found 
  very 
  expedient 
  or 
  even 
  

   indispensable. 
  

  

  