﻿LXII 
  

  

  either 
  side 
  of 
  an 
  island 
  which 
  contains 
  the 
  ponds 
  devoted 
  to 
  

   breeding 
  purposes. 
  

  

  There 
  is 
  nothing 
  special 
  to 
  attract 
  our 
  attention 
  in 
  the 
  con- 
  

   struction 
  of 
  these 
  three 
  ponds, 
  except 
  the 
  depressions 
  near 
  

   the 
  outlet 
  (known 
  as 
  collectors 
  or 
  kettles), 
  into 
  which 
  the 
  iish 
  

   are 
  gradually 
  drawn 
  when 
  the 
  water 
  is 
  taken 
  from 
  the 
  ponds. 
  

  

  The 
  ponds 
  marked 
  «, 
  J, 
  c, 
  d, 
  e 
  and 
  ,/, 
  are 
  used 
  exclusively 
  

   for 
  breeding 
  purposes. 
  The 
  outlet 
  of 
  each 
  of 
  these 
  ponds 
  

   connects 
  with 
  a 
  drain-pipe 
  which 
  discharges 
  itself 
  into 
  the 
  

   Potomac 
  River. 
  At 
  the 
  outlet 
  of 
  each 
  there 
  is 
  a 
  kettle, 
  as 
  

   in 
  those 
  just 
  mentioned, 
  in 
  which 
  the 
  fish 
  are 
  collected. 
  

  

  These 
  ponds 
  are 
  not 
  level, 
  sloping 
  from 
  two 
  inches 
  to 
  

   to 
  four 
  feet 
  (in 
  deptli), 
  the 
  deepest 
  parts 
  being 
  at 
  the 
  collectors. 
  

   They 
  are 
  well 
  furnished 
  with 
  aquatic 
  plants, 
  and 
  a 
  portion 
  of 
  

   those 
  marked 
  a 
  and 
  b 
  are 
  provided 
  with 
  movable 
  partitions 
  

   constructed 
  in 
  the 
  shallow 
  parts. 
  These 
  separate 
  the 
  more 
  

   open 
  space 
  of 
  the 
  pond 
  from 
  that 
  of 
  a 
  denser 
  aquatic 
  growth. 
  

   The 
  spawning 
  fish 
  eagerly 
  seek 
  those 
  portions 
  well 
  provided 
  

   with 
  grasses, 
  and 
  after 
  depositing 
  their 
  eggs 
  they 
  are 
  allowed 
  to 
  

   return 
  to 
  the 
  more 
  open 
  space. 
  The 
  partitions 
  are 
  then 
  put 
  in 
  

   place 
  to 
  prevent 
  their 
  re-visiting 
  the 
  grassy 
  parts 
  and 
  disturb- 
  

   ing 
  their 
  eggs. 
  

  

  Figures 
  1, 
  2, 
  3, 
  4, 
  5 
  and 
  6 
  represent 
  tanks 
  into 
  which 
  the 
  

   water 
  can 
  be 
  introduced. 
  These 
  are 
  used 
  for 
  stowing 
  and 
  

   sorting 
  the 
  fish. 
  No. 
  7 
  represents 
  the 
  watch-house 
  occupied 
  

   by 
  the 
  guard 
  and 
  attendants. 
  

  

  The 
  thorough 
  confidence 
  of 
  Prof. 
  Baird 
  in 
  the 
  ultimate 
  

   success 
  of 
  the 
  experiment 
  of 
  introducing 
  this 
  fish 
  into 
  Amer- 
  

   ican 
  waters 
  is 
  shown 
  by 
  his 
  persistent 
  and 
  repeated 
  efibrts 
  to 
  

   import 
  them. 
  The 
  good 
  results 
  have 
  more 
  than 
  realized 
  our 
  

   expectations, 
  for 
  the 
  growth 
  and 
  weight 
  of 
  the 
  imported 
  fish 
  

   and 
  the 
  excellence 
  of 
  their 
  ofi'spring 
  have 
  been 
  greater 
  than 
  

   under 
  the 
  most 
  favorable 
  circumstances 
  in 
  Euroj^e. 
  

  

  The 
  normal 
  weiglit 
  attained 
  by 
  the 
  carp, 
  in 
  Europe, 
  when 
  

   three 
  years 
  old 
  (the 
  age 
  of 
  maturity), 
  is 
  said 
  to 
  be 
  from 
  three 
  

   to 
  four 
  pounds. 
  Those, 
  however, 
  that 
  were 
  imported 
  into 
  

   tliis 
  country 
  now 
  weigh 
  from 
  nine 
  to 
  ten 
  pounds. 
  

  

  