﻿MANUAL 
  OF 
  FISH-CULTURE. 
  

  

  151 
  

  

  the 
  metal 
  plate, 
  admits 
  the 
  glass 
  tube 
  wliicli 
  carries 
  off 
  the 
  waste 
  

   water. 
  The 
  central 
  tube 
  is 
  connected 
  by 
  half-inch 
  rubber 
  tubing 
  Avith 
  

   the 
  pet-cock, 
  which 
  regulates 
  the 
  suj)ply 
  of 
  water. 
  A 
  groove 
  in 
  the 
  

   inner 
  surface 
  of 
  the 
  metallic 
  plate 
  carries 
  a 
  rubber 
  collar, 
  and 
  when 
  

   the 
  plate 
  is 
  in 
  place 
  the 
  tightening 
  of 
  the 
  metallic 
  screw-cap 
  seals 
  the 
  

   opening 
  hermetically. 
  Both 
  the 
  inlet 
  and 
  outlet 
  tubes 
  pass 
  through 
  

   stuflfing-boxes 
  provided 
  with 
  gum-washers 
  and 
  binding- 
  screws. 
  The 
  

   central 
  or 
  feed 
  tube 
  is 
  provided 
  with 
  stuffing-boxes, 
  one 
  on 
  the 
  top 
  of 
  

   the 
  disk 
  and 
  one 
  on 
  the 
  bottom, 
  the 
  better 
  to 
  hold 
  it 
  to 
  a 
  true 
  center. 
  

   The 
  outlet 
  tube 
  is 
  provided 
  with 
  only 
  one 
  stuffing-box, 
  and 
  the 
  binding- 
  

   ring 
  is 
  beveled. 
  

  

  In 
  preparing 
  the 
  jar 
  for 
  work 
  the 
  side 
  tube 
  is 
  fitted 
  first. 
  The 
  glass 
  

   tube 
  should 
  be 
  wet, 
  the 
  gum- 
  washer 
  slipped 
  on 
  the 
  tube 
  about 
  an 
  inch 
  

   from 
  the 
  end 
  and 
  introduced 
  into 
  the 
  opening. 
  Holding 
  the 
  tube 
  per- 
  

   pendicularly 
  to 
  the 
  face 
  of 
  the 
  i)late, 
  press 
  fairly 
  on 
  the 
  tube, 
  and 
  the 
  

   washer, 
  rolling 
  on 
  itself, 
  will 
  fall 
  into 
  the 
  seat 
  provided 
  for 
  it. 
  Screw 
  

   on 
  the 
  binding- 
  

  

  J 
  

  

  ring, 
  and 
  test 
  by 
  

   seeing 
  that 
  the 
  

   tube 
  slides 
  freely 
  

   back 
  and 
  forth 
  in 
  

   the 
  stuffing-box; 
  

   if 
  not, 
  it 
  should 
  

   be 
  refitted 
  with 
  a 
  

   heavier 
  or 
  lighter 
  

   washer, 
  as 
  maybe 
  

   required. 
  Glass 
  

   tubes 
  can 
  not 
  be 
  

   l)rocured 
  of 
  abso- 
  

   lute 
  uniformity 
  in 
  

  

  I 
  I 
  

  

  Egg 
  Fiimiel. 
  

  

  size. 
  Water 
  is 
  the 
  only 
  lubricant 
  that 
  should 
  be 
  used 
  about 
  the 
  jar 
  

   fittings. 
  

  

  The 
  jar, 
  after 
  being 
  washed 
  clean, 
  is. 
  filled 
  with 
  fresh 
  water. 
  A 
  

   shallow 
  tin 
  funnel 
  with 
  a 
  perforated 
  rim 
  is 
  inserted, 
  so 
  that 
  the 
  water 
  

   will 
  stand 
  as 
  high 
  in 
  the 
  funnel-throat 
  as 
  possible, 
  and 
  the 
  eggs 
  are 
  

   poured 
  in 
  by 
  dipperfuls, 
  or 
  when 
  taken 
  from 
  transportation 
  trays 
  are 
  

   washed 
  in 
  by 
  a 
  jet 
  of 
  water. 
  Care 
  is 
  used 
  to 
  have 
  the 
  eggs 
  fall 
  but 
  a 
  

   short 
  distance, 
  and 
  no 
  fish 
  scales 
  or 
  other 
  foreign 
  matter 
  should 
  enter 
  

   the 
  jar 
  with 
  them, 
  as 
  the 
  presence 
  of 
  anything 
  but 
  water 
  and 
  eggs 
  ren- 
  

   ders 
  a 
  proper 
  motion 
  of 
  the 
  mass 
  impossible, 
  and 
  usually 
  results 
  in 
  the 
  

   loss 
  of 
  a 
  large 
  proportion 
  of 
  the 
  eggs. 
  The 
  requisite 
  number 
  of 
  eggs, 
  

   80,000 
  to 
  100,000, 
  being 
  in 
  the 
  jar, 
  it 
  is 
  put 
  in 
  position 
  and 
  closed, 
  

   care 
  being 
  taken 
  that 
  both 
  the 
  inlet 
  and 
  outlet 
  tubes 
  slide 
  freely 
  in 
  

   their 
  stuffing-boxes. 
  If 
  the 
  tubes 
  become 
  gummed, 
  let 
  water 
  trickle 
  

   down 
  around 
  the 
  binding-screws. 
  To 
  close 
  the 
  jar, 
  turn 
  on 
  the 
  water, 
  

   place 
  the 
  feed-tube 
  in 
  the 
  jar, 
  turning 
  off" 
  the 
  water 
  immediately 
  after 
  

   the 
  feed-tube 
  has 
  passed 
  beneath 
  the 
  surface 
  of 
  the 
  water 
  in 
  the 
  jar, 
  

  

  