﻿198 
  

  

  HUBERT 
  M. 
  MORRIS. 
  

  

  By 
  means 
  of 
  this 
  device 
  the 
  soil 
  is 
  washed 
  through 
  a 
  series 
  of 
  sieves 
  with 
  meshes 
  

   of 
  decreasing 
  size. 
  The 
  mesh 
  of 
  the 
  final 
  sieve 
  is 
  small 
  enough 
  to 
  retain 
  either 
  all 
  

   the 
  insects 
  or 
  all 
  but 
  the 
  most 
  minute, 
  while 
  at 
  the 
  same 
  time 
  allowing 
  the 
  finest 
  

   soil 
  particles 
  to 
  be 
  washed 
  away. 
  

  

  P 
  ,' 
  ? 
  3 
  4 
  5 
  6 
  7 
  8 
  9 
  10 
  II 
  12 
  inches 
  

  

  hrri-r 
  I 
  r 
  ■! 
  i 
  I 
  r 
  I 
  i 
  l 
  i 
  I 
  i 
  I 
  i 
  1 
  ! 
  i 
  i 
  l 
  i 
  i 
  

  

  Fig. 
  2. 
  Median 
  vertical 
  section 
  of 
  apparatus 
  : 
  a, 
  ledge 
  ; 
  b, 
  shelf 
  ; 
  

   c, 
  first 
  funnel; 
  d, 
  first 
  sieve, 
  with 
  holes 
  3-5 
  mm. 
  in 
  diameter; 
  

   e, 
  second 
  funnel 
  ; 
  /, 
  second 
  sieve, 
  with 
  holes 
  1 
  • 
  5 
  mm. 
  in 
  diameter 
  ; 
  

   g, 
  third 
  funnel 
  ; 
  h, 
  third 
  sieve, 
  with 
  50 
  meshes 
  to 
  the 
  inch 
  ; 
  

   i, 
  outlet 
  for 
  water 
  ; 
  k, 
  pipe 
  connected 
  to 
  water 
  supply 
  ; 
  /, 
  rose. 
  

  

  