﻿dr 
  davy's 
  observations 
  on 
  the 
  charr. 
  333 
  

  

  I 
  have 
  had 
  no 
  opportunity 
  to 
  try 
  the 
  effect 
  of 
  sea 
  or 
  salt 
  water 
  on 
  the 
  impreg- 
  

   nated 
  ova 
  of 
  the 
  salmon. 
  The 
  few 
  experiments 
  I 
  have 
  been 
  able 
  to 
  make 
  on 
  the 
  

   young 
  fish 
  have 
  given 
  results 
  favourable 
  to 
  the 
  above 
  conjecture. 
  I 
  shall 
  briefly 
  

   relate 
  them. 
  

  

  On 
  the 
  10th 
  of 
  April, 
  a 
  young 
  fish, 
  about 
  an 
  inch 
  in 
  length, 
  its 
  permanent 
  fins 
  

   fully 
  formed, 
  taken 
  from 
  a 
  small 
  pool 
  in 
  the 
  bed 
  of 
  the 
  Leven 
  (the 
  river 
  that 
  flows 
  

   out 
  of 
  Windermere, 
  and 
  then 
  unusually 
  low) 
  was 
  put 
  into 
  a 
  half-pint 
  of 
  salt 
  

   water, 
  of 
  the 
  specific 
  gravity 
  10277. 
  It 
  lived 
  about 
  thirty-three 
  minutes. 
  Shortly 
  

   after, 
  a 
  smolt, 
  the 
  instant 
  it 
  was 
  taken 
  was 
  put 
  into 
  the 
  same 
  water 
  ; 
  it 
  was 
  

   about 
  seven 
  inches 
  in 
  length, 
  and 
  its 
  head 
  was 
  not 
  constantly 
  under 
  water. 
  It 
  

   lived 
  about 
  an 
  hour. 
  From 
  comparative 
  experiments 
  with 
  fresh 
  water, 
  I 
  am 
  led 
  

   to 
  infer 
  that 
  in 
  the 
  same 
  limited 
  quantity 
  of 
  river 
  water, 
  it 
  might 
  have 
  lived 
  two 
  

   hours 
  ; 
  the 
  limit 
  being 
  probably 
  the 
  exhaustion 
  of 
  the 
  air. 
  When 
  a 
  stronger 
  so- 
  

   lution 
  of 
  salt 
  was 
  used 
  — 
  that 
  in 
  the 
  preceding 
  experiments 
  being 
  nearly 
  the 
  same 
  

   as 
  sea- 
  water 
  — 
  the 
  effects 
  were 
  far 
  more 
  decided. 
  Thus 
  a 
  fish 
  of 
  the 
  same 
  size 
  as 
  

   that 
  first 
  mentioned, 
  put 
  into 
  a 
  saturated 
  solution 
  of 
  common 
  salt, 
  died 
  in 
  two 
  

   minutes 
  ; 
  and 
  a 
  parr 
  taken 
  on 
  the 
  10th 
  of 
  October, 
  measuring 
  about 
  four 
  inches 
  

   in 
  length, 
  put 
  into 
  a 
  solution 
  of 
  common 
  salt 
  of 
  the 
  specific 
  gravity 
  1047, 
  died 
  in 
  

   a 
  few 
  minutes. 
  

  

  April 
  12, 
  1852. 
  

  

  VOL. 
  XX. 
  PART 
  III. 
  4 
  X 
  

  

  