﻿5T 
  

  

  In 
  recapitulation, 
  I 
  might 
  say 
  that 
  the 
  important 
  points 
  to 
  

   the 
  Commission 
  for 
  its 
  work 
  another 
  year 
  would 
  be, 
  1st, 
  

   the 
  procuring 
  of 
  suitable 
  fish. 
  2cl. 
  The 
  careful 
  manipulation 
  

   of 
  the 
  spawn 
  ahsolutely 
  dry, 
  or 
  the 
  nearest 
  convenient 
  

   approach 
  to 
  it, 
  3d. 
  The 
  temperature 
  of 
  the 
  water, 
  about 
  

   44°, 
  and 
  its 
  freedom 
  from 
  funjri. 
  

  

  EMBKYOLOGY 
  OF 
  THE 
  SMELT. 
  

  

  The 
  following 
  notes 
  upon 
  the 
  embryology 
  of 
  the 
  Karitan 
  

   river 
  Smelt 
  were 
  made 
  in 
  March 
  and 
  April, 
  1877, 
  at 
  New 
  

   Brunswick, 
  N. 
  J., 
  Avhile 
  the 
  Commission 
  was 
  engaged 
  in 
  

   prosecuting 
  the 
  hatching 
  of 
  Smelt 
  spawn, 
  the 
  methods 
  of 
  

   Avhich 
  process 
  have 
  already 
  been 
  described. 
  I 
  do 
  not 
  in- 
  

   tend 
  to 
  treat 
  of 
  tlie 
  histological 
  development 
  of 
  the 
  

   Smelt 
  — 
  or 
  of 
  its 
  minute 
  cell 
  structure 
  — 
  except 
  so 
  far 
  as 
  it 
  

   can 
  be 
  made 
  out 
  in 
  the 
  living 
  specimen 
  ; 
  since 
  a 
  histological 
  

   study, 
  made 
  from 
  sections 
  cut 
  from 
  hardened 
  specimens, 
  is 
  

   of 
  value 
  and 
  interest 
  only 
  to 
  science 
  and 
  scientific 
  students^ 
  

   not 
  to 
  the 
  general 
  reader. 
  This 
  paper 
  will, 
  therefore, 
  serve 
  

   merely 
  as 
  the 
  basis 
  of 
  what 
  I 
  trust, 
  at 
  some 
  future 
  time, 
  to 
  

   make 
  a 
  histological 
  research, 
  and 
  hence, 
  must 
  be 
  taken 
  with 
  

   that 
  alloAvancc 
  for 
  error, 
  both 
  in 
  the 
  personal 
  equation 
  and 
  

   the 
  equation 
  of 
  sight, 
  to 
  which 
  all 
  research 
  is 
  liable 
  when 
  

   unauthenticated 
  by 
  collateral 
  or 
  difierent 
  methods. 
  

  

  My 
  method 
  of 
  study 
  was 
  either 
  to 
  take 
  the 
  eggs 
  from 
  the 
  

   hatching 
  jars, 
  one 
  or 
  more 
  at 
  a 
  time, 
  and 
  examine 
  them 
  

   upon 
  a 
  watch-glass 
  in 
  a 
  few 
  drops 
  of 
  water, 
  or 
  to 
  dissect 
  the 
  

   vitelline 
  membrane 
  or 
  shell 
  from 
  the 
  egg, 
  and 
  examine 
  the 
  

   uncovered 
  embryo 
  in 
  a 
  drop 
  of 
  water, 
  or 
  sodic-chloride, 
  Na. 
  

   CI. 
  ^fc, 
  upon 
  a 
  glass 
  slide, 
  under 
  a 
  low 
  objective 
  in 
  the 
  mi- 
  

   croscope. 
  Tn 
  this 
  manner 
  I 
  examined 
  egg 
  after 
  egg, 
  until 
  I 
  

   became 
  satisfied 
  upon 
  any 
  or 
  all 
  observed 
  conditions, 
  and 
  

   was 
  able 
  to 
  trace 
  a 
  pretty 
  clear 
  sequence 
  of 
  developments. 
  

   My 
  invesLlgatio:is 
  were 
  made 
  with 
  Zeiss 
  oculars 
  2 
  and 
  4, 
  and 
  

   objectives 
  A 
  and 
  B, 
  giving 
  a 
  range 
  of 
  power 
  from 
  90 
  to 
  400 
  

   diameters. 
  

  

  