﻿42 
  

  

  previously 
  suggested, 
  the 
  destruction 
  of 
  sucli 
  unwelcome 
  

   intrtidHi's 
  njay 
  be 
  very 
  readily 
  effected. 
  "'Drills*' 
  and 
  

   boring 
  sponges 
  are 
  naturally 
  to 
  be 
  thought 
  of 
  as 
  types 
  

   Avhich 
  should 
  be 
  destroyed, 
  while 
  diatoms, 
  infusoria, 
  

   small 
  polyps, 
  bryozoa, 
  minute 
  algae, 
  etc., 
  are 
  to 
  be 
  

   favored 
  in 
  every 
  way. 
  Those 
  forms 
  again, 
  which 
  the 
  

   oyster 
  culturist 
  knows 
  are 
  tliere 
  only 
  for 
  the 
  purpose 
  of 
  

   getting 
  a 
  good 
  living 
  with 
  little 
  trouble 
  to 
  themselves, 
  

   ought 
  to 
  be 
  destroyed. 
  

  

  It 
  might 
  be 
  an 
  advantage 
  to 
  introduce 
  certain 
  desirable 
  

   forms 
  onto 
  a 
  bank, 
  which 
  might 
  be 
  supposed 
  to 
  be 
  use- 
  

   ful 
  as 
  a 
  food 
  supply. 
  Infusoria 
  and 
  diatoms 
  not 
  pre- 
  

   viously 
  existing 
  might 
  be 
  introduced 
  in 
  this 
  way 
  ; 
  this, 
  

   I 
  think, 
  would 
  be 
  especially 
  easy 
  in 
  the 
  case 
  of 
  the 
  for- 
  

   mer 
  where 
  the 
  type 
  Avas 
  one 
  which 
  is 
  fixed 
  during 
  its 
  

   adult 
  life. 
  

  

  METHODS 
  OF 
  COLLECTING 
  AND 
  COLLECTING 
  APPAKATIS. 
  

  

  Not 
  having 
  reached 
  the 
  field 
  until 
  the 
  19th 
  of 
  July, 
  I 
  

   did 
  not 
  succeed 
  in 
  testing 
  the 
  various 
  collectors, 
  which 
  

   were 
  for 
  the 
  most 
  part 
  modelled 
  after 
  those 
  in 
  use 
  in 
  

   France, 
  as 
  thoroughly 
  as 
  1 
  desired. 
  Kooling 
  slates, 
  tiles, 
  

   shingles, 
  oyster 
  shells 
  and 
  pine 
  cones 
  were 
  used 
  to 
  afford 
  

   attachment 
  to 
  the 
  ycmngfryof 
  the 
  oyster: 
  in 
  all 
  cases 
  the 
  

   apparatus 
  was 
  of 
  course 
  submerged, 
  l)ut 
  was 
  not 
  allowed 
  

   to 
  sink 
  low 
  enough 
  so 
  as 
  to 
  be 
  in 
  contact 
  with 
  or 
  par- 
  

   tially 
  buried 
  in 
  the 
  mud. 
  The 
  most 
  successful 
  apparatus 
  

   used 
  was 
  the 
  various 
  modifications 
  of 
  the 
  slate 
  collector, 
  

   and 
  which 
  in 
  practice 
  will 
  probably 
  be 
  found 
  the 
  most 
  

   satisfactory 
  in 
  the 
  long 
  run. 
  We 
  first 
  coated 
  the 
  slates 
  

   with 
  amixture 
  of 
  lime 
  and 
  sand, 
  ndxed 
  in 
  sea-water, 
  thick 
  

   enough 
  to 
  cover 
  the 
  surfaces 
  when 
  dipped 
  into 
  the 
  mix 
  

   ture 
  with 
  a 
  pretty 
  thick 
  layer; 
  an 
  eighth 
  of 
  an 
  inch 
  is 
  

   not 
  too 
  much, 
  so 
  that 
  when 
  the 
  young 
  fry 
  has 
  attained 
  

   a 
  considerable 
  size 
  it 
  maybe 
  removed 
  without 
  injury 
  

   along 
  with 
  the 
  coating 
  of 
  mortar, 
  a 
  method 
  first 
  intro- 
  

   duced 
  in 
  Europe 
  by 
  Dr. 
  Kemmerer, 
  though 
  he 
  used 
  

  

  