﻿1094 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  [120] 
  

  

  into 
  the 
  basin. 
  Thence 
  the 
  spat 
  floats 
  gently 
  into 
  compartments 
  over 
  

   end-gates 
  until 
  it 
  finds 
  stones 
  and 
  rubbish 
  there 
  placed 
  to 
  which 
  it 
  

   attaches 
  itself. 
  By 
  the 
  employment 
  of 
  the 
  perforated 
  vessel 
  the 
  spawn 
  

   is 
  held 
  together 
  until 
  ready 
  to 
  float 
  off. 
  Then 
  when 
  it 
  does 
  go 
  it 
  follows 
  

   the 
  small 
  and 
  gentle 
  currents 
  flowing 
  outward 
  in 
  all 
  directions, 
  and 
  be- 
  

   comes 
  well 
  separated 
  and 
  distributed, 
  giving 
  each 
  living 
  young 
  oyster 
  

   a 
  chance 
  to 
  find 
  its 
  lodgment. 
  The 
  end-gates 
  of 
  the 
  compartments 
  are 
  

   vertically 
  movable. 
  The 
  first 
  set, 
  namely, 
  those 
  nearest 
  the 
  entrance, 
  

   are 
  first 
  closed, 
  and 
  a 
  small 
  flow 
  of 
  water 
  is 
  permitted 
  over 
  them 
  into 
  

   the 
  compartments 
  following. 
  The 
  young 
  then 
  coming 
  down 
  with 
  the 
  

   gentle 
  current 
  find 
  such 
  stones 
  or 
  rubbish 
  as 
  may 
  be 
  in 
  that 
  part 
  of 
  

   the 
  canals 
  and 
  cling 
  to 
  them. 
  The 
  cock 
  in 
  the 
  pipe 
  from 
  the 
  tank 
  is 
  

   then 
  turned 
  to 
  shut 
  off 
  the 
  supply 
  of 
  water 
  until 
  as 
  many 
  of 
  the 
  young 
  

   as 
  possible 
  settle 
  down 
  to 
  their 
  places. 
  Then 
  the 
  first 
  set 
  of 
  gates 
  is 
  

   raised 
  and 
  the 
  next 
  set 
  is 
  pushed 
  down 
  and 
  the 
  supply 
  again 
  turned 
  

   on, 
  and 
  so 
  on. 
  The 
  entire 
  apparatus 
  is 
  housed, 
  and 
  has 
  a 
  general 
  in- 
  

   cline 
  from 
  the 
  basin 
  toward 
  the 
  last 
  of 
  the 
  compartments. 
  

  

  CLAIMS. 
  

  

  " 
  1. 
  The 
  combination, 
  with 
  the 
  water-tank 
  B, 
  having 
  the 
  pipe 
  b 
  and 
  

   cock 
  c, 
  of 
  the 
  basin 
  C, 
  provided 
  in 
  its 
  center 
  with 
  a 
  perforated 
  annular 
  

   vessel, 
  D, 
  a 
  series 
  of 
  passages 
  formed 
  by 
  the 
  extended 
  sides 
  of 
  the 
  

   basin 
  and 
  divided 
  by 
  a 
  central 
  partition, 
  and 
  a 
  series 
  of 
  vertically-ad- 
  

   justable 
  gates, 
  G, 
  and 
  canals, 
  constructed 
  as 
  shown, 
  and 
  for 
  the 
  pur- 
  

   pose 
  herein 
  set 
  forth. 
  

  

  "2. 
  The 
  basin 
  C, 
  having' 
  outlets 
  E, 
  and 
  the 
  annular 
  perforated 
  vessel 
  

   D, 
  in 
  combination 
  with 
  the 
  canals 
  F, 
  having 
  gates 
  G, 
  adjustable, 
  and 
  

   rocks 
  or 
  rubbish 
  in 
  their 
  bottoms, 
  and 
  a 
  means 
  for 
  supplying 
  vessel 
  D 
  

   with 
  a 
  gentle 
  flow 
  of 
  sea- 
  water, 
  substantially 
  as 
  herein 
  described." 
  

  

  No. 
  263933. 
  

  

  (Marshall 
  McDonald, 
  Washington, 
  D. 
  C, 
  assignor 
  to 
  himself 
  and 
  Stephen 
  C. 
  Brown, 
  

   of 
  Ur! 
  same 
  place 
  ; 
  patented 
  September 
  5, 
  1882 
  ; 
  method 
  of 
  and 
  apparatus 
  for 
  hatch- 
  

   ing 
  fish. 
  See 
  Plate 
  CXLVI.) 
  

  

  The 
  object 
  is 
  to 
  provide 
  a 
  method 
  of 
  and 
  apparatus 
  for 
  hatching 
  fish, 
  

   automatically 
  agitating 
  the 
  eggs, 
  eliminating 
  the 
  small 
  fry 
  as 
  soon 
  as 
  

   hatched, 
  and 
  separating 
  the 
  bad 
  eggs 
  and 
  old 
  shells, 
  and 
  thereby 
  avoid- 
  

   ing 
  the 
  contamination 
  of 
  the 
  sound 
  ones. 
  The 
  eggs 
  are 
  agitated 
  by 
  a 
  

   forced 
  circulation 
  of 
  water 
  in 
  a 
  closed 
  chamber 
  which 
  is 
  entirely 
  filled 
  

   with 
  water, 
  taking 
  off 
  the 
  discharge- 
  water 
  and 
  with 
  it 
  the 
  bad 
  eggs 
  (or 
  

   small 
  fry, 
  as 
  the 
  case 
  may 
  be), 
  at 
  a 
  point 
  central 
  with 
  respect 
  to 
  the 
  

   body 
  of 
  the 
  chamber, 
  in 
  contradistinction 
  to 
  taking 
  off 
  the 
  bad 
  eggs 
  at 
  

   the 
  surface 
  by 
  overflow 
  from 
  an 
  open 
  jar. 
  A 
  pipe 
  above 
  supplies 
  water 
  

   underpressure 
  and 
  of 
  a 
  temperature 
  between 
  50° 
  and 
  80° 
  (of 
  what 
  ther- 
  

   moneter 
  scale 
  is 
  not 
  stated). 
  Beneath 
  this 
  are 
  the 
  hatching-jar 
  and 
  the 
  

  

  