﻿174 
  JJOTAXICAL 
  GAZETTE. 
  [)%> 
  

  

  ment 
  killing 
  the 
  tissue 
  and 
  thus 
  preparing 
  the 
  way 
  for 
  the 
  

   growth 
  of 
  the 
  fungus. 
  

  

  _De 
  Bary 
  vvas 
  of 
  the 
  opinion 
  that 
  fungi 
  living 
  thus 
  were 
  in 
  

   an 
  intermediate 
  stage 
  between 
  parasites 
  and 
  saprophytes, 
  and 
  

   were 
  gradually 
  changing 
  their 
  method 
  of 
  growth 
  from 
  one 
  to 
  

   the 
  olher. 
  However 
  this 
  maybe, 
  it 
  seems 
  to 
  me 
  that 
  as 
  these 
  

   lungi 
  do 
  not 
  materially 
  differ 
  in 
  other 
  respects 
  from 
  numbers 
  

   ot 
  other 
  fungi, 
  we 
  may 
  expect 
  to 
  find 
  that 
  this 
  method 
  of 
  

   growth 
  IS 
  far 
  from 
  uncommon. 
  

  

  It 
  is 
  a 
  well 
  established 
  fact 
  that 
  one 
  group 
  of 
  fungi, 
  bac- 
  

   teria, 
  grovv 
  in 
  this 
  way 
  and 
  thus 
  produce 
  the 
  so-called 
  germ 
  

   diseases. 
  Thus 
  it 
  would 
  sp^m 
  fi-...<- 
  fU^.^ 
  r,,„^„„. 
  j;.^.c^. 
  if 
  

  

  gons 
  nisPHses. 
  if 
  

  

  not 
  fungous 
  diseases 
  in 
  general, 
  are 
  essentially 
  the 
  same 
  in 
  

   nature 
  as 
  the 
  bacterial 
  diseases. 
  The 
  production 
  of 
  a 
  chem- 
  

   ical 
  poison 
  in 
  these 
  fungi 
  may 
  either 
  be 
  simply 
  a 
  product 
  of 
  

   tneii 
  grovvth, 
  or 
  may 
  be 
  a 
  special 
  adaptation 
  of 
  these 
  organ- 
  

   isms 
  tor 
  obtaining 
  food. 
  I 
  should 
  incline 
  to 
  the 
  former 
  view 
  

   as 
  the 
  more 
  probable 
  one. 
  On 
  the 
  chemical 
  nature 
  of 
  this 
  

   pioauct, 
  and 
  its 
  destructiveness 
  to 
  any 
  associated 
  organisms 
  

   must 
  depend 
  the 
  efficiency 
  of 
  the 
  fungus 
  as 
  an 
  agenfof 
  dis- 
  

  

  ^.J^ 
  V'' 
  !"?" 
  """' 
  purpose 
  in 
  this 
  article 
  to 
  indicate 
  by 
  a 
  few 
  

   examples 
  taken 
  as 
  representatives, 
  that 
  what 
  has 
  been 
  shown 
  

   to 
  De 
  true 
  of 
  one 
  group 
  of 
  fungi 
  (bacteria) 
  as 
  disease 
  agents, 
  

  

  then 
  V 
  '' 
  T^^^'' 
  °.^ 
  ^'^^^'•^' 
  ^"d 
  that 
  the 
  so-called 
  "toxic 
  

  

  ease^in 
  generT'" 
  '' 
  '"P'^^' 
  "^ 
  ""^""^^°" 
  ^° 
  ^""^°"^ 
  ^'" 
  

   Ursino, 
  Elizabeth, 
  N. 
  J. 
  

  

  Apical 
  growth 
  in 
  roots 
  of 
  Marsilia 
  quadrifolia 
  and 
  Eqnisetuin 
  

  

  arvense. 
  

  

  WM. 
  M, 
  ANDRE)\^S. 
  

  

  I 
  Imve 
  found''^'^^'" 
  ''P'"'' 
  S™""' 
  '° 
  'he 
  roots 
  of 
  these 
  plants, 
  

   these 
  points 
  .nd 
  a.s^o 
  t'^Z^.I^lJtl'S^^.:^^! 
  

  

  