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  Photo-synthesis 
  in 
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  Studies 
  of 
  Photo-synthesis 
  in 
  Fresh-water 
  Algce. 
  — 
  1. 
  The 
  Fixation 
  

   of 
  both 
  Carbon 
  and 
  Nitrogen 
  from 
  the 
  Atmosphere 
  to 
  form 
  

   Organic 
  Tissue 
  by 
  the 
  Green 
  Plant 
  Cell. 
  2. 
  Nutrition 
  and 
  

   Growth 
  produced 
  by 
  High 
  Gaseous 
  Dilutions 
  of 
  Simple 
  

   Organic 
  Compounds, 
  .,~ 
  n 
  h 
  as 
  Formaldehyde 
  and 
  Methylic 
  

   Alcohol. 
  3. 
  Nutrition 
  and 
  Growth 
  by 
  means 
  of 
  High 
  Dilu- 
  

   tions 
  of 
  Carbon 
  Dioxide 
  and 
  Oxides 
  of 
  Nitrogen 
  ivithout 
  

   Access 
  to 
  Atmosphere. 
  

  

  By 
  Benjamin 
  Moore, 
  F.E.S., 
  and 
  T. 
  Arthur 
  Webster. 
  

  

  (Received 
  January 
  30, 
  1920.) 
  

  

  (From 
  the 
  Department 
  of 
  Applied 
  Physiology, 
  Medical 
  Besearch 
  Committee.) 
  

  

  The 
  two 
  most 
  primaeval 
  and 
  most 
  fundamental 
  chemical 
  processes 
  for 
  

   living 
  organisms 
  are 
  those 
  two 
  in 
  which 
  their 
  living 
  substance 
  is 
  synthesised 
  

   from 
  inorganic 
  sources 
  with 
  uptake 
  of 
  energy. 
  By 
  one 
  of 
  these 
  carbon 
  is 
  

   built 
  into 
  organic 
  compounds, 
  starting 
  with 
  the 
  oxidised 
  carbon 
  dioxide 
  of 
  the 
  

  

  vol. 
  xci. 
  — 
  B. 
  R 
  

  

  