﻿498 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  

  

  Growth 
  meamrements 
  of 
  Ranunculus 
  aquatiUs 
  trichophyUus 
  at 
  the 
  end 
  of 
  sixty-one 
  

   Original 
  length 
  of 
  each 
  cutting, 
  15 
  cm. 
  

  

  The 
  roots 
  of 
  anchored 
  plants 
  were 
  exposed 
  to 
  light, 
  and 
  this 
  fact 
  

   must 
  be 
  remembered 
  when 
  comparing 
  these 
  plants 
  with 
  those 
  whose 
  

   roots 
  entered 
  the 
  substratum. 
  If, 
  however, 
  the 
  roots 
  are 
  only 
  for 
  

   attachment, 
  then 
  exposure 
  to 
  light 
  should 
  not 
  be 
  a 
  disturbing 
  factor 
  

   in 
  the 
  amount 
  of 
  growth 
  of 
  the 
  rest 
  of 
  the 
  plant. 
  

  

  Referring 
  to 
  the 
  above 
  tables, 
  the 
  most 
  notable 
  feature 
  is 
  that 
  only 
  

   one 
  of 
  the 
  cuttings 
  rooted 
  in 
  soil 
  failed 
  to 
  develop 
  lateral 
  branches, 
  

   while 
  not 
  a 
  single 
  plant 
  of 
  the 
  other 
  three 
  groups 
  developed 
  a 
  lateral 
  

   branch. 
  Although 
  the 
  total 
  growth 
  of 
  the 
  plants 
  rooted 
  in 
  sand 
  

   slightly 
  exceeds 
  that 
  of 
  the 
  main 
  stem 
  of 
  those 
  rooted 
  in 
  soil, 
  the 
  large 
  

   number 
  of 
  lateral 
  branches 
  developed 
  b}^ 
  the 
  latter 
  increases 
  their 
  total 
  

  

  