﻿bo 
  found 
  in 
  Mr. 
  Eice's 
  report 
  to 
  me 
  of 
  his 
  observations 
  upon 
  

   the 
  development 
  of 
  the 
  Shad, 
  on 
  page 
  95, 
  et 
  seq. 
  

  

  The 
  Frontispiece 
  of 
  this 
  report 
  is 
  a 
  representation 
  of 
  the 
  

   apparatus 
  referred 
  to 
  on 
  page 
  7, 
  which 
  was 
  erected 
  on 
  the 
  

   steamer 
  Lookout. 
  

  

  This 
  apparatus 
  consists 
  of 
  tank 
  *'B," 
  which 
  is 
  placed 
  on 
  

   a 
  tank 
  "C," 
  to 
  give 
  it 
  an 
  elevation 
  sufficient 
  to 
  supply 
  the 
  

   Kcveral 
  inverted 
  cones 
  '"'A/' 
  with 
  a 
  constant 
  circulation 
  of 
  

   water 
  ; 
  this 
  is 
  supplied 
  by 
  means 
  of 
  a 
  steam 
  pump, 
  located 
  

   below 
  the 
  deck 
  and 
  provided 
  Avith 
  steam 
  from 
  the 
  boiler, 
  

   which 
  also 
  supplies 
  the 
  n^ain 
  engine. 
  Tlie 
  water 
  is 
  drawn 
  

   direct 
  from 
  overboard 
  through 
  the 
  sea-cock, 
  and 
  is 
  con- 
  

   ducted 
  from 
  tank 
  '^B" 
  through 
  filters 
  ""a," 
  and 
  rubber 
  tubes 
  

   attached, 
  to 
  the 
  apices 
  of 
  the 
  inverted 
  cones, 
  and 
  overflows 
  

   at 
  "f. 
  "' 
  The 
  waste 
  water 
  is 
  conducted 
  througli 
  pipes 
  ^'e" 
  

   into 
  waste-tank 
  ''D/' 
  and 
  thence 
  carried 
  overboard 
  through 
  

   pipe 
  "E." 
  The 
  distributing-tank 
  "B" 
  is 
  provided 
  with 
  a 
  

   tube 
  "g," 
  which 
  serves 
  a 
  double 
  purpose 
  — 
  an 
  outlet 
  for 
  the 
  

   air, 
  and, 
  when 
  necessary, 
  an 
  overflow 
  for 
  the 
  surplus 
  water. 
  

   When 
  it 
  is 
  necessary 
  to 
  famish 
  a 
  stronger 
  flow 
  by 
  direct 
  

   action 
  of 
  the 
  pump, 
  the 
  rubber 
  tubes 
  can 
  be 
  transferred 
  from 
  

   the 
  filters 
  ''a" 
  to 
  pipes 
  ''d," 
  and 
  the 
  valve 
  at 
  "b"' 
  shut 
  off, 
  so 
  

   as 
  to 
  force 
  the 
  water 
  directly 
  into 
  the 
  inverted 
  cones. 
  The 
  

   pump 
  is 
  furnisiicd 
  with 
  two 
  suction 
  orifices, 
  and 
  when 
  run- 
  

   ning 
  in 
  salt 
  water, 
  the 
  outlet 
  ^'E" 
  is 
  so 
  arranged 
  that 
  by 
  

   turning 
  it 
  into 
  the 
  hatch 
  shown 
  in 
  the 
  drawing, 
  and 
  at- 
  

   taching 
  it 
  to 
  the 
  suction 
  pump, 
  the 
  water, 
  after 
  having 
  

   j)assed 
  through 
  the 
  hatching 
  cones 
  "A," 
  is 
  repumped 
  into 
  

   tank 
  '^B," 
  and 
  a 
  circulation 
  of 
  the 
  same 
  water 
  kept 
  up. 
  

  

  The 
  large 
  tank 
  "C," 
  which 
  is 
  used 
  for 
  a 
  support 
  to 
  tank 
  

   B, 
  is 
  also 
  supplied 
  with 
  fresh 
  water, 
  to 
  replace 
  any 
  waste 
  

   from 
  splashing, 
  evaporation, 
  ttc. 
  It 
  will 
  be 
  seen 
  that 
  by 
  

   means 
  of 
  this 
  apparatus, 
  hatching 
  operations 
  can 
  be 
  con- 
  

   ducted 
  on 
  board 
  the 
  steamer, 
  whether 
  in 
  motion 
  or 
  lying 
  at 
  

   anchor, 
  either 
  in 
  fresh 
  water, 
  when 
  the 
  sujDply 
  is 
  taken 
  from 
  

   overboard, 
  or 
  in 
  salt 
  water, 
  when 
  the 
  circulation 
  apd 
  renewf^l 
  

  

  