﻿430 
  

  

  Rusk: 
  Protoplasmic 
  streaming 
  

  

  \ 
  

  

  

  

  TABLE 
  II 
  

  

  \ 
  

  

  

  

  

  CUARA 
  

  

  h 
  

  

  4 
  

  

  Fraction 
  N 
  

  

  No. 
  of 
  cells 
  

  

  Distance 
  in 
  

  

  Rate 
  per 
  100 
  microns 
  

  

  % 
  Acceleration 
  of 
  

  

  ZnS04 
  

  

  , 
  tested 
  

  

  microns 
  

  

  in 
  seconds 
  

  

  1 
  normal 
  

  

  f 
  O.OOOO 
  

  

  18 
  

  

  '595 
  

  

  2.48s 
  

  

  

  

  1 
  0.0003 
  

  

  18 
  

  

  595 
  

  

  2.485 
  

  

  

  

  / 
  0.0000 
  

  

  2 
  \ 
  

  

  18 
  

  

  595 
  

  

  2.92 
  

  

  

  

  1 
  0.0004 
  

  

  18 
  

  

  595 
  

  

  2.82 
  

  

  3-4 
  

  

  f 
  0.0000 
  

   ^ 
  \ 
  0.0005 
  

  

  18 
  

  

  595 
  

  

  2.69 
  

  

  

  

  18 
  

  

  595 
  

  

  2.41 
  

  

  10.41 
  

  

  f 
  0.0000 
  

   ^ 
  1 
  O.OOIO 
  

  

  15 
  

  

  420 
  

  

  4.18 
  

  

  

  

  15 
  

  

  420 
  

  

  3.32 
  

  

  20.58 
  

  

  r 
  0.0000 
  

  

  18 
  

  

  595 
  

  

  2.71 
  

  

  

  

  ^ 
  1 
  0.0015 
  

  

  18 
  

  

  595 
  

  

  2.45 
  

  

  9.6 
  

  

  , 
  f 
  0.0000 
  

  

  18 
  

  

  595 
  

  

  2.45 
  

  

  1 
  ^ 
  

  

  

  

  \ 
  0.0020 
  

  

  18 
  

  

  - 
  595 
  

  

  ! 
  2.45 
  

  

  

  

  It 
  appears, 
  then, 
  that 
  Elodea 
  cells 
  are 
  sensitive 
  to 
  weaker 
  zinc 
  

   sulphate 
  than 
  Chara 
  cells, 
  but 
  that 
  the 
  maximum 
  acceleration 
  is 
  

   less. 
  It 
  is 
  also 
  evident 
  that 
  the 
  concentrations 
  of 
  zinc 
  sulphate 
  

   found 
  by 
  this 
  study 
  to 
  cause 
  the 
  greatest 
  acceleration 
  of 
  streaming 
  

  

  .20.5 
  3*% 
  

  

  aooo3 
  N 
  

  

  CU0OC5N 
  

  

  • 
  C.OCIOM 
  

  

  o;oci5"N 
  

  

  o,oo;^OM 
  

  

  0j0OO4-N 
  

  

  H 
  ■- 
  

  

  Fig. 
  2. 
  Graph 
  showing 
  per 
  cent 
  acceleration 
  ,of 
  movement 
  in 
  Chara 
  cells 
  by 
  

   solutions 
  of 
  zinc 
  sulphate. 
  

  

  in 
  Elodea 
  and 
  Cham, 
  are 
  in 
  the 
  neighborhood 
  of 
  those 
  found 
  to 
  

   cause 
  the 
  greatest 
  stimulation 
  of 
  the 
  growth 
  and 
  metabolic 
  activi- 
  

   ties 
  in 
  certain 
  fungi 
  by 
  the 
  work 
  of 
  Richards 
  (2, 
  3) 
  and 
  Latham 
  (4) 
  

   already 
  referred 
  to. 
  

  

  