﻿2G2 
  MacDougal: 
  Growth 
  of 
  the 
  tomato 
  

  

  so 
  that 
  small 
  green 
  fruits 
  were 
  resting 
  securely 
  on 
  cork 
  blocks- 
  

   The 
  vertical 
  swinging 
  arm 
  of 
  an 
  auxograph. 
  also 
  tipped 
  with 
  cork 
  

   was 
  now 
  brought 
  to 
  rest 
  on 
  the 
  upper 
  surface 
  of 
  the 
  fruit. 
  Any 
  

   variation 
  in 
  volume 
  would 
  be 
  denoted 
  by 
  a 
  deviation 
  of 
  the 
  pen 
  

   tracing 
  from 
  a 
  horizontal 
  line. 
  A 
  full 
  description 
  of 
  this 
  apparatus 
  

   IS 
  given 
  in 
  connection 
  with 
  /. 
  i 
  of 
  the 
  publication 
  cited 
  above. 
  

   The 
  temperatures 
  in 
  this 
  and 
  in 
  my 
  other 
  work 
  on 
  growth 
  and 
  

   swelling 
  were 
  taken 
  by 
  mercurial 
  thermometers 
  thrust 
  into 
  tissues 
  

   or 
  in 
  contact 
  with 
  the 
  bodies 
  under 
  observation. 
  In 
  the 
  present 
  

   instance 
  small 
  thermometers 
  of 
  the 
  "clinical" 
  type 
  were 
  thrust 
  

   into 
  fruits 
  similar 
  to 
  those 
  being 
  measured 
  and 
  rernained 
  there 
  

   during 
  their 
  development, 
  causing 
  but 
  little 
  divergence 
  from 
  nor- 
  

  

  F 
  

  

  mal 
  morphology. 
  The 
  fruit 
  stood 
  between 
  15 
  and 
  20° 
  C. 
  duruig 
  

  

  the 
  experiments, 
  which 
  was 
  on 
  an 
  average 
  8-10° 
  below 
  the 
  opti- 
  

  

  mum 
  for 
  these 
  plants, 
  but 
  the 
  relative 
  humidity 
  was 
  favorably 
  

   high. 
  

  

  The 
  points 
  to 
  be 
  presented 
  may 
  be 
  demonstrated 
  by 
  the 
  

   action 
  of 
  two 
  fruits 
  which 
  were 
  kept 
  under 
  continuous 
  measure- 
  

   ment, 
  one 
  for 
  thirty-eight 
  and 
  the 
  other 
  for 
  thirty-five 
  days. 
  

  

  Fruit 
  No. 
  I 
  had 
  a 
  diameter 
  of 
  6 
  mm. 
  and 
  a 
  volume 
  of 
  113 
  cu, 
  

   mm. 
  when 
  its 
  measurement 
  was 
  begun, 
  and 
  its 
  volume 
  increased 
  

   at 
  the 
  rate 
  of 
  130 
  cu. 
  mm. 
  daily 
  "for 
  six 
  days, 
  402 
  cu. 
  mm. 
  for 
  the 
  

   following 
  seven 
  days, 
  409 
  cu. 
  mm, 
  for 
  seven 
  days, 
  560 
  cu. 
  mm. 
  for 
  

   nine 
  days 
  and 
  930 
  cu. 
  mm. 
  for 
  the 
  last" 
  9 
  days, 
  at 
  which 
  time 
  the 
  

  

  ■ 
  

  

  total 
  volume 
  was 
  19,864 
  cu. 
  mm. 
  

  

  The 
  rate 
  of 
  increase 
  of 
  the 
  diameter 
  of 
  these 
  fruits 
  during 
  the 
  

   same 
  periods 
  was 
  0.8 
  mm., 
  i 
  mm., 
  0.55 
  mm. 
  and 
  0,6 
  mm. 
  daily. 
  

   A 
  graph 
  plotted 
  from 
  these 
  daily 
  rates 
  would 
  give 
  a 
  highly 
  erron- 
  

   eous 
  impression 
  as 
  to 
  the 
  actual 
  course 
  of 
  accession 
  of 
  material 
  to 
  

   the 
  fruits, 
  which 
  is 
  the 
  essential 
  feature 
  of 
  growth. 
  If 
  the 
  rate 
  of 
  

   growth 
  be 
  multiplied 
  by 
  twenty-five 
  and 
  placed 
  in 
  a 
  table 
  above 
  

   the 
  average 
  daily 
  increase 
  in 
  volume 
  for 
  the 
  same 
  period, 
  a 
  com- 
  

   parison 
  may 
  be 
  made 
  without 
  the 
  aid 
  of 
  a 
  graph. 
  

  

  It 
  is 
  to 
  be 
  seen 
  that 
  the 
  rate 
  of 
  increase 
  in 
  the 
  diameter 
  of 
  the 
  

  

  ate 
  of 
  increase 
  week 
  

  

  Diameter 
  , 
  . 
  20 
  

  

  Volume 
  22 
  

  

  Second 
  

   wetk 
  

  

  Third 
  Fourth 
  Fifth 
  

  

  week 
  week 
  week 
  

  

  25 
  14 
  15 
  16 
  

  

  57 
  1 
  5^ 
  63 
  103 
  

  

  