﻿54 
  

  

  one 
  of 
  the 
  slates 
  suspended 
  by 
  means 
  of 
  wire 
  from 
  strips 
  

   extending 
  across 
  the 
  top 
  of 
  the 
  box 
  from 
  one 
  side 
  to 
  the 
  

   other. 
  It 
  seemed 
  to 
  me, 
  however, 
  that 
  tliere 
  was 
  little 
  

   doubt 
  but 
  that 
  the 
  single 
  3'oung 
  oyster 
  found 
  on 
  the 
  slate 
  

   seventeen 
  days 
  after 
  the 
  spawn 
  had 
  been 
  put 
  into 
  the 
  

   box. 
  was 
  one 
  of 
  the 
  embryos 
  which 
  had 
  been 
  so 
  intro- 
  

   duced. 
  The 
  flannel, 
  like 
  the 
  cotton, 
  becomes 
  befouled 
  

   in 
  a 
  few 
  days 
  with 
  a 
  muddy 
  deposit 
  held 
  together 
  with 
  

   a 
  disagreeable 
  slimy 
  material 
  : 
  it, 
  like 
  cotton 
  and 
  bolting 
  

   cloth, 
  rots 
  in 
  a 
  coui^le 
  of 
  weeks 
  so 
  as 
  to 
  be 
  easily 
  torn 
  by 
  

   fishes 
  and 
  other 
  w 
  ater 
  animals, 
  such 
  as 
  musk-rats. 
  Once 
  

   the 
  enclosure 
  has 
  been 
  invaded 
  by 
  a 
  larger 
  animal 
  forcing 
  

   its 
  way 
  through 
  the 
  flannel, 
  as 
  happened 
  in 
  the 
  case 
  of 
  

   the 
  large 
  box, 
  one 
  can 
  no 
  longer 
  be 
  certain 
  that 
  embryos 
  

   naturally 
  fertilized 
  in 
  the 
  open 
  waters 
  may 
  not 
  have 
  

   found 
  their 
  way 
  in. 
  The 
  experiment 
  with 
  the 
  large 
  box 
  

   was 
  useful 
  however, 
  as 
  showing 
  that 
  embryo 
  ascidians 
  

   and 
  barnacles 
  might 
  be 
  pretty 
  eflFectiuilly 
  excluded 
  by 
  the 
  

   use 
  of 
  textile 
  iiiembranes 
  through 
  which 
  the 
  water 
  had 
  

   to 
  be 
  strained 
  before 
  it 
  could 
  tenter 
  the 
  ])Ox. 
  

  

  PKOPOSEI) 
  NEW' 
  METHODS 
  OF 
  (•AltIX(; 
  FOK 
  AKTIFICl 
  ALLY 
  

   l.MPi:F.(4XA'rEI) 
  EG(iS. 
  

  

  From 
  this 
  season's 
  experience 
  it 
  results 
  that 
  I 
  have 
  but 
  

   little 
  faitJi 
  in 
  floating 
  boxes 
  or 
  enclosures 
  of 
  any 
  kind 
  in 
  

   wiiich 
  cloth 
  is 
  used 
  to 
  keep 
  the 
  eggs 
  or 
  embryos 
  confined. 
  

   FeAv 
  cloths 
  are 
  evenly 
  and 
  closely 
  enough 
  Avoven, 
  if 
  they 
  

   could 
  be 
  kept 
  clean, 
  to 
  retain 
  in 
  an 
  enclosure 
  eggs 
  as 
  

   small 
  as 
  the 
  l-oOO 
  of 
  an 
  inch 
  in 
  diameter, 
  which 
  is 
  about 
  

   the 
  size 
  of 
  those 
  of 
  the 
  oyster, 
  clam, 
  ship-worm 
  and 
  per- 
  

   haps 
  many 
  moi'e 
  marine 
  animals 
  of 
  various 
  types, 
  such 
  

   as 
  embryologists 
  would 
  Ix- 
  glad 
  to 
  study, 
  provided 
  they 
  

   had 
  ariai)])aratiis 
  which 
  would 
  enable 
  them 
  to 
  work 
  con- 
  

   tinuously. 
  

  

  Finding 
  that 
  wiiai 
  we 
  wanted 
  was 
  a 
  device 
  which 
  

   would 
  enable 
  the 
  operator 
  to 
  change 
  the 
  water 
  on 
  the 
  

   embryos 
  and 
  eggs 
  continuously 
  and 
  at 
  the 
  same 
  time 
  not 
  

  

  