﻿VI 
  

  

  For 
  convenience 
  of 
  reference 
  these 
  sttitenients 
  liave 
  

   been 
  developed 
  in 
  the 
  accompanying 
  diagram, 
  rnfortu- 
  

   _nate]y, 
  no 
  reliable 
  records 
  of 
  the 
  hshei-ies 
  at 
  the 
  head 
  of 
  

   the 
  Bay 
  and 
  the 
  niontli 
  of 
  the 
  Susquehanna 
  Kiver 
  for 
  

   the 
  years 
  prior 
  to 
  1870. 
  could 
  be 
  procured: 
  and, 
  conse- 
  

   quently, 
  no 
  such 
  conipaiative 
  diagram, 
  or 
  statement, 
  of 
  

   the 
  movement 
  of 
  the 
  tish 
  previous 
  to 
  that 
  time 
  can 
  now 
  

   be 
  made. 
  15efore 
  analyzing 
  the 
  diagram 
  let 
  us 
  glance 
  at 
  

   the 
  table 
  showing 
  the 
  amount 
  of 
  lish 
  marketed 
  in 
  Wash- 
  

   ington 
  and 
  Alexandria 
  during 
  the 
  last 
  fifteen 
  years 
  ; 
  — 
  

   the 
  records 
  of 
  sah^s 
  in 
  these 
  two 
  cities 
  indicating, 
  pretty 
  

   accurately, 
  the 
  yield 
  fiom 
  the 
  Potomac 
  River, 
  per- 
  

   haps 
  ten 
  oi" 
  twenty 
  per 
  <-ent. 
  of 
  tlie 
  total 
  amount 
  being 
  

   taken 
  up 
  by 
  the 
  inhabitants 
  of 
  tlie 
  adjacent 
  country. 
  

  

  Assuming, 
  then, 
  that 
  the 
  number 
  of 
  lish 
  sold 
  in 
  the 
  

   two 
  cities 
  named 
  rex)re«ents 
  t»h(^ 
  yield 
  of 
  the 
  Potomac, 
  

   we 
  have 
  a 
  total 
  catcli 
  of 
  l(),()'2l,444 
  sliad 
  for 
  the 
  fifteen 
  

   years 
  from 
  186(5 
  to 
  1880: 
  giving 
  an 
  average 
  of 
  870.109 
  for 
  

   the 
  first 
  hve 
  years: 
  874,114 
  for 
  the 
  next 
  five: 
  and 
  S8o,o6f) 
  

   for 
  the 
  period 
  from 
  1870 
  to 
  1880 
  : 
  and 
  sliowing 
  a 
  very 
  

   remarkable 
  decrease 
  in 
  the 
  yiehl 
  from 
  this 
  i-iver. 
  The 
  

   yield 
  for 
  the 
  second 
  live 
  years, 
  tluit 
  is, 
  from 
  K871 
  to 
  1875, 
  

   althougli 
  apparently 
  greater 
  tlian 
  the 
  avei-age 
  of 
  the 
  

   previous 
  five 
  years, 
  was. 
  no 
  doubt, 
  tlie 
  result 
  of 
  more 
  

   extended 
  fishing: 
  as 
  comparatively 
  few 
  fish 
  were 
  taken 
  

   in 
  18()(), 
  in 
  (^onsequence 
  of 
  the 
  fisheries 
  not 
  having 
  recov- 
  

   ered 
  from 
  the 
  effects 
  of 
  the 
  war, 
  and 
  of 
  the 
  fishermen 
  

   being 
  without 
  equipment. 
  It 
  will 
  be 
  observed 
  that 
  this 
  

   decrease 
  would 
  be 
  even 
  nu)re 
  marked 
  but 
  for 
  the 
  catches 
  

   of 
  1871) 
  and 
  1880: 
  as, 
  in 
  the 
  last 
  mentioned 
  year, 
  when 
  

   the 
  results 
  of 
  artificial 
  propagation 
  began 
  to 
  be 
  realized, 
  

   Ave 
  have 
  055,122 
  — 
  an 
  inci'ease 
  of 
  inoie 
  than 
  200.000 
  over 
  

   the 
  average 
  yield. 
  

  

  The 
  average 
  of 
  the 
  ])receding 
  five 
  years, 
  again, 
  was 
  

   enlarged 
  by 
  the 
  exce])tional 
  yield 
  of 
  1878 
  : 
  l)ut 
  the 
  large 
  

   catch 
  of 
  this 
  year 
  was 
  i)robably 
  owing 
  to 
  the 
  ])reA'alence 
  

   of 
  easterly 
  winds 
  and 
  other 
  meteorological 
  influences; 
  as 
  

  

  