﻿XOVI 
  

  

  details 
  of 
  which 
  will 
  be 
  given 
  in 
  another 
  connection. 
  

   B^ 
  indicates 
  a 
  frame, 
  enclosing 
  the 
  end 
  of 
  the 
  dis- 
  

   charge 
  pij^e 
  leading 
  from 
  the 
  pond 
  ; 
  and 
  provided 
  with 
  

   screens, 
  s. 
  s. 
  ,<?., 
  the 
  purpose 
  of 
  which 
  will 
  be 
  indicated 
  

   hereafter. 
  

  

  (7, 
  is 
  the 
  "collector," 
  into 
  which 
  the 
  tish 
  are 
  drawn 
  by 
  

   the 
  lowering 
  of 
  the 
  water 
  in 
  the 
  pond 
  ; 
  and 
  c 
  a 
  valve, 
  

   which 
  controls 
  the 
  flow 
  of 
  the 
  water 
  through 
  the 
  dis- 
  

   charge 
  pipe, 
  m. 
  

  

  Z>, 
  indicates 
  the 
  position 
  and 
  direction 
  of 
  a 
  wide, 
  shal- 
  

   low 
  drain 
  at 
  the 
  bottom 
  of 
  the 
  pond 
  ; 
  having 
  smaller 
  

   drains, 
  d. 
  d. 
  d. 
  d., 
  by 
  means 
  of 
  which 
  all 
  of 
  the 
  water 
  is 
  

   led 
  into 
  the 
  collector 
  when 
  the 
  pond 
  is 
  being 
  emptied. 
  

  

  E^ 
  represents 
  the 
  embankments 
  ; 
  which 
  are 
  about 
  six 
  

   feet 
  in 
  height 
  at 
  the 
  angle 
  of 
  the 
  pond, 
  the 
  lowest 
  part 
  

   of 
  the 
  meadow 
  gradually 
  lessening 
  with 
  the 
  ascent 
  of 
  

   the 
  land 
  until 
  they 
  are 
  lost 
  in 
  the 
  higher 
  ground. 
  

  

  In 
  the 
  next 
  plate 
  the 
  upper 
  portion 
  presents 
  a 
  longitu- 
  

   dinal 
  section 
  of 
  the 
  pond. 
  The 
  lower 
  part 
  of 
  the 
  plate 
  

   shows 
  a 
  portion 
  of 
  the 
  same 
  section 
  enlarged, 
  so 
  that 
  

   with 
  the 
  horizontal 
  projections 
  the 
  position 
  and 
  detail 
  

   arrangements 
  of 
  the 
  pond 
  are 
  clearly 
  illustrated. 
  The 
  

   fish 
  are 
  readily 
  drawn 
  into 
  the 
  collector 
  C. 
  A 
  long 
  han- 
  

   dle 
  ho(>k 
  for 
  removing 
  the 
  planks 
  g^ 
  g. 
  g, 
  is 
  shown 
  at 
  h. 
  

   As 
  already 
  stated, 
  the 
  "overflow,'' 
  indicated 
  at 
  0, 
  

   is 
  perhaps 
  the 
  most 
  important 
  point 
  to 
  be 
  considered, 
  

   and 
  especial 
  attention 
  is 
  therefore 
  directed 
  to 
  its 
  con- 
  

   struction. 
  By 
  way 
  of 
  precaution 
  this 
  outlet 
  is 
  loca- 
  

   ted 
  in 
  the 
  solid 
  ground 
  at 
  the 
  side 
  of 
  the 
  pond, 
  rather 
  

   than 
  in 
  any 
  part 
  of 
  the 
  embankment, 
  which 
  might 
  be 
  

   weakened 
  by 
  its 
  presence 
  ; 
  and 
  is 
  protected 
  by 
  three 
  wire- 
  

   cloth 
  screens 
  of 
  varying 
  texture, 
  the 
  coarser 
  mesh 
  being 
  

   placed 
  farthest 
  in 
  the 
  pond 
  in 
  order 
  to 
  collect 
  all 
  drift, 
  and 
  

   thus 
  prevent 
  the 
  clogging 
  of 
  the 
  second 
  and 
  third 
  screens, 
  

   the 
  meshes 
  of 
  which 
  should 
  be 
  fine 
  enough 
  to 
  preclude 
  the 
  

   escape 
  of 
  the 
  smallest 
  fish. 
  It 
  will 
  also 
  be 
  observed 
  that 
  

   the 
  screens 
  are 
  so 
  placed 
  as 
  to 
  present 
  a 
  considerable 
  

  

  