﻿460 
  Carey: 
  A 
  starch 
  gel 
  

  

  this 
  starch 
  gel 
  presents. 
  The 
  study 
  of 
  such 
  systems 
  becomes 
  of 
  

   interest, 
  not 
  only 
  on 
  account 
  of 
  the 
  mere 
  increase 
  in 
  size 
  — 
  the 
  

   swelling 
  which 
  takes 
  place 
  on 
  immersion 
  in 
  water 
  with 
  the 
  impli- 
  

   cations 
  that 
  such 
  phenomena 
  have 
  as 
  regards 
  growth 
  phenomena 
  

   but 
  also 
  on 
  account 
  of 
  its 
  possible 
  relation 
  to 
  problems 
  of 
  meta- 
  

   bolism. 
  

  

  Since 
  no 
  chemical 
  analyses 
  w^ere 
  made 
  (except 
  those 
  for 
  re- 
  

   ducing 
  sugars 
  in 
  the 
  water 
  in 
  which 
  the 
  strips 
  had 
  stood), 
  the 
  

   writer 
  cannot 
  say 
  whether 
  any 
  changes 
  took 
  place 
  in 
  the 
  starch 
  

   due 
  to 
  the 
  temperatures 
  employed, 
  either 
  in 
  the 
  structure 
  of 
  

   the 
  starch 
  grains 
  or 
  chemically, 
  but 
  simply 
  gives 
  this 
  method 
  as 
  a 
  

   means 
  of 
  preparing 
  a 
  fairly 
  resistant 
  starch 
  gel 
  which 
  is 
  easily 
  

   handled, 
  

  

  I 
  wish 
  to 
  thank 
  Dr. 
  Herbert 
  M. 
  Richards 
  for 
  his 
  valuable 
  idea 
  

   on 
  the 
  method 
  and 
  his 
  helpful 
  suggestions 
  throughout 
  the 
  work^ 
  

   which 
  are 
  greatly 
  appreciated. 
  

  

  Botanical 
  Laboratory, 
  

   Barnard 
  College, 
  

  

  Columbia 
  University 
  . 
  

  

  Literature 
  cited 
  

  

  I. 
  MacDougal, 
  D, 
  T. 
  The 
  relation 
  of 
  growth 
  and 
  swelling 
  of 
  plants 
  

  

  and 
  biocolloids 
  to 
  temperature. 
  Proc. 
  See. 
  Exper, 
  Biol. 
  Med. 
  

   15:48-50. 
  1917. 
  

  

  2- 
  MacDougal, 
  D. 
  T. 
  Imbibitional 
  swelling 
  of 
  plants 
  and 
  colloidal 
  

  

  mixtures. 
  Science 
  II. 
  44: 
  502-505. 
  1916. 
  

  

  3. 
  Maquenne, 
  L., 
  & 
  Roux, 
  E, 
  Sur 
  la 
  constitution, 
  la 
  saccharification 
  

  

  et 
  la 
  r^trogradation 
  des 
  empois 
  de 
  fecule. 
  Compt. 
  Rend. 
  Acad. 
  

   Sci. 
  Paris 
  140: 
  1303-1308, 
  1905. 
  

  

  4. 
  Maquenne 
  L,, 
  & 
  Roux, 
  E. 
  Influence 
  de 
  la 
  reaction 
  du 
  milieu 
  sur 
  

  

  Tactivit^ 
  de 
  Tamylase 
  et 
  la 
  composition 
  des 
  empois 
  saccharifies, 
  

   Ibid, 
  142: 
  124-129, 
  1906. 
  

  

  5. 
  Meyer, 
  A. 
  Beitrage 
  zur 
  Kenntnis 
  der 
  Gallerten, 
  besonders 
  der 
  

  

  Striike-gallerten. 
  Kolloldchem. 
  Beih. 
  5: 
  1-48. 
  191 
  3. 
  

  

  6. 
  Roux, 
  E. 
  Sur 
  la 
  transformation 
  de 
  Tamylocellulose 
  en 
  amidon. 
  

  

  Compt. 
  Rend. 
  Acad. 
  Sci. 
  Paris 
  140: 
  440—442. 
  1905. 
  

  

  7. 
  Taylor, 
  W. 
  W. 
  Chemistry 
  of 
  colloids. 
  New 
  York. 
  1915. 
  

  

  