﻿94 
  Dr. 
  W. 
  B. 
  Bottomley. 
  The 
  Effect 
  of 
  Nitrogen-fixing 
  

  

  Table 
  VI 
  — 
  continued. 
  

  

  Series 
  No. 
  

  

  Dish 
  

  

  1st 
  

  

  2nd 
  

  

  3rd 
  

  

  4th 
  

  

  5th 
  

  

  6th 
  

  

  7th 
  

  

  No. 
  

  

  week. 
  

  

  week. 
  

  

  week. 
  

  

  week. 
  

  

  week. 
  

  

  week. 
  

  

  week. 
  

  

  IV. 
  

  

  

  

  

  

  

  

  

  

  

  Detmer's 
  Solution 
  

  

  r 
  

  

  16 
  

   17 
  

  

  37 
  

  

  36 
  

  

  93 
  

   86 
  

  

  244 
  

   240 
  

  

  480 
  

   536 
  

  

  864 
  

   800 
  

  

  1,344 
  

   1,280 
  

  

  3,392 
  

   4,096 
  

  

  + 
  

  

  Ash 
  from 
  Azoto- 
  

   baeter 
  

  

  i 
  

  

  18 
  

   19 
  

  

  37 
  

   37 
  

  

  83 
  

   96 
  

  

  244 
  

   264 
  

  

  472 
  

   480 
  

  

  864 
  

   960 
  

  

  1,472 
  

   1,472 
  

  

  4,480 
  

   4,160 
  

  

  I 
  

  

  20 
  

  

  39 
  

  

  78 
  

  

  240 
  

  

  488 
  

  

  928 
  

  

  1,472 
  

  

  4,608 
  

  

  

  

  — 
  

  

  37 
  -2 
  

  

  87 
  -2 
  

  

  246 
  -4 
  

  

  491 
  -2 
  

  

  883 
  -2 
  

  

  1,408-0 
  

  

  4,147 
  -2 
  

  

  V. 
  

  

  

  

  

  

  

  

  

  

  

  

  r 
  

   i 
  

  

  21 
  

  

  40 
  

  

  99 
  

  

  340 
  

  

  872 
  

  

  1,632 
  

  

  4,864 
  

  

  25,216 
  

  

  Detmer's 
  Solution 
  

  

  22 
  

  

  36 
  

  

  102 
  

  

  340 
  

  

  832 
  

  

  2,048 
  

  

  5,184 
  

  

  26,048 
  

  

  + 
  

  

  i 
  

  

  23 
  

  

  47 
  

  

  102 
  

  

  324 
  

  

  776 
  

  

  1,760 
  

  

  4,928 
  

  

  22,464 
  

  

  Azotobacter 
  

  

  24 
  

  

  48 
  

  

  108 
  

  

  328 
  

  

  800 
  

  

  1,792 
  

  

  4,480 
  

  

  25,024 
  

  

  

  i 
  

  

  25 
  

  

  43 
  

  

  108 
  

  

  324 
  

  

  792 
  

  

  2,048 
  

  

  5,56S 
  

  

  28,608 
  

  

  Mean 
  

  

  

  

  42-8 
  

  

  103-8 
  

  

  331 
  -2 
  

  

  814 
  -4 
  

  

  1,856 
  -0 
  

  

  5,004 
  -8 
  

  

  25,472 
  

  

  The 
  weights 
  of 
  the 
  fractions 
  discarded 
  week 
  by 
  week, 
  as 
  compared 
  with 
  

   the 
  original 
  weight 
  of 
  the 
  plants, 
  is 
  shown 
  in 
  the 
  following 
  Table 
  : 
  — 
  

  

  Table 
  VII. 
  

  

  Series 
  No. 
  

  

  Weight 
  of 
  100 
  plants 
  in 
  milligrams. 
  

  

  

  

  

  

  

  

  

  

  At 
  beginning. 
  

  

  3rd 
  week. 
  

  

  4th 
  week. 
  

  

  5th 
  week. 
  

  

  6th 
  week. 
  

  

  7th 
  week. 
  

  

  I 
  

  

  14 
  -6 
  

  

  11 
  -2 
  

  

  11 
  -o 
  

  

  10 
  -4 
  

  

  9-6 
  

  

  8 
  

  

  •9 
  

  

  II 
  

  

  14-6 
  

  

  11 
  -7 
  

  

  11 
  -3 
  

  

  10 
  -9 
  

  

  10-5 
  

  

  9 
  

  

  •4 
  

  

  III 
  

  

  14-6 
  

  

  14-2 
  

  

  15 
  -2 
  

  

  20-6 
  

  

  20 
  -9 
  

  

  20 
  

  

  *5 
  

  

  IV 
  

  

  14-6 
  

  

  11 
  -5 
  

  

  10 
  -3 
  

  

  9-7 
  

  

  9 
  -1 
  

  

  8 
  

  

  •1 
  

  

  V 
  

  

  14 
  -6 
  

  

  14 
  -3 
  

  

  14-9 
  

  

  18-6 
  

  

  18-8 
  

  

  18 
  

  

  •3 
  

  

  The 
  ash 
  of 
  the 
  nucleic 
  acid 
  derivatives 
  and 
  the 
  Azotobacter 
  had 
  evidently 
  not 
  

   the 
  slightest 
  effect 
  on 
  the 
  growth 
  of 
  Zemna 
  minor, 
  and 
  the 
  beneficial 
  results 
  

   following 
  the 
  addition 
  of 
  these 
  materials 
  can 
  only 
  be 
  attributed 
  to 
  their 
  

   organic 
  constituents. 
  

  

  Conclusion. 
  

  

  The 
  chief 
  interest 
  of 
  the 
  present 
  work 
  centres 
  around 
  two 
  facts 
  : 
  first, 
  that 
  

   the 
  addition 
  of 
  the 
  derivatives 
  from 
  nucleic 
  acid 
  which 
  has 
  undergone 
  decom- 
  

   position 
  in 
  decaying 
  vegetable 
  matter 
  — 
  peat 
  — 
  has 
  a 
  marked 
  effect 
  on 
  the 
  

   growth 
  of 
  Lemna 
  plants 
  in 
  water 
  culture 
  ; 
  and 
  second, 
  that 
  the 
  nitrogen- 
  

  

  