﻿MacDougal-: 
  Growth 
  of 
  the 
  tomato 
  

  

  2G9 
  

  

  plant 
  structure 
  in 
  which 
  the 
  dry 
  weight 
  does 
  not 
  increase 
  with 
  

   age. 
  

  

  1 
  

  

  1 
  1 
  , 
  The 
  amino-acids 
  induce 
  a 
  greater 
  sweUing 
  or 
  absorption 
  of 
  

   water 
  by 
  the 
  cell 
  masses 
  of 
  growing 
  tomato 
  fruits 
  than 
  takes 
  place 
  

   in 
  weak 
  acid 
  solutions 
  or 
  in 
  water. 
  This 
  fact 
  is 
  in 
  agreement 
  

   with, 
  and 
  is 
  probably 
  fundamental 
  to, 
  the 
  accelerating 
  effect 
  of 
  

  

  these 
  substances 
  on 
  growth. 
  

  

  12. 
  Continuous 
  measurements 
  of 
  tomato 
  fruits 
  reveal 
  slackened 
  

   growth 
  or 
  shrinkage 
  in 
  the 
  midday 
  period 
  corresponding 
  to 
  the 
  

   time 
  of 
  greatest 
  transpiration, 
  and 
  it 
  is 
  concluded 
  that 
  water 
  

   absorption 
  during 
  this 
  period 
  is 
  balanced 
  by 
  the 
  loss 
  from 
  the 
  

   surface, 
  in 
  accordance 
  with 
  the 
  behavior 
  of 
  many 
  other 
  structures, 
  

   such 
  as 
  trunks 
  and 
  twigs 
  of 
  trees, 
  stems 
  of 
  sunflowers, 
  joints 
  of 
  

   Optmtia, 
  and 
  leaves 
  of 
  Mesembryanthemtim. 
  

  

  Desert 
  Laboratory 
  

  

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