﻿NOV. 
  4, 
  1922 
  PROCEEDINGS 
  : 
  BOTANICAL 
  SOCIETY 
  421 
  

  

  tance 
  behind 
  the 
  pharynx, 
  as 
  in 
  Dorylaimus. 
  N. 
  denticulatus 
  appears 
  

   to 
  be 
  closely 
  related 
  to 
  N. 
  pachydermatus 
  , 
  in 
  which 
  quite 
  possibly 
  

   dermal 
  pores 
  may 
  have 
  been 
  overlooked. 
  

  

  The 
  mouth 
  structures 
  of 
  Nygolaimi 
  appear 
  to 
  harmonize 
  with 
  the 
  

   supposition 
  that 
  the 
  lip 
  region 
  can 
  be 
  expanded 
  and 
  the 
  lips 
  everted. 
  

   Otherwise 
  it 
  is 
  rather 
  difficult 
  to 
  understand 
  how 
  the 
  onchium 
  can 
  be 
  

   efficiently 
  used. 
  The 
  denticles 
  are 
  in 
  relatively 
  about 
  the 
  same 
  posi- 
  

   tion 
  as 
  in 
  Mononchus, 
  subgenus 
  Mylonchulus, 
  but 
  not 
  in 
  two 
  distinct 
  

   patches. 
  It 
  seems 
  quite 
  apparent 
  that 
  the 
  vestibule, 
  when 
  closed, 
  

   is 
  disposed 
  in 
  folds 
  which 
  would 
  admit 
  of 
  its 
  opening 
  out 
  in 
  accordance 
  

   with 
  the 
  above 
  supposition. 
  The 
  Nygolairas 
  are 
  carnivorous. 
  

  

  PROCEEDINGS 
  OF 
  THE 
  ACADEMY 
  AND 
  AFFILIATED 
  

  

  SOCIETIES 
  

  

  BOTANICAL 
  SOCIETY 
  

  

  156th 
  meeting 
  

  

  The 
  156th 
  meeting 
  of 
  the 
  Botanical 
  Society 
  of 
  Washington 
  was 
  held 
  at 
  

   the 
  Cosmos 
  Club, 
  on 
  January 
  3, 
  1922, 
  with 
  about 
  75 
  members 
  and 
  guests 
  

   present, 
  and 
  President 
  Safford 
  in 
  the 
  chair. 
  Messrs. 
  Ernst 
  F. 
  Artsch- 
  

   WAGER, 
  Arthur 
  C. 
  Dillman, 
  Dr. 
  Chas. 
  Drechsler, 
  Dr. 
  Arthur 
  S. 
  Rhoads, 
  

   Ernst 
  S. 
  Schultz, 
  Victor 
  F. 
  Tapke, 
  and 
  W. 
  H. 
  Tisdale, 
  all 
  of 
  the 
  Bureau 
  

   of 
  Plant 
  Industry, 
  were 
  elected 
  members 
  of 
  the 
  Society. 
  

  

  Brief 
  notes 
  and 
  reviews 
  of 
  literature. 
  — 
  P. 
  L. 
  Ricker 
  stated 
  that 
  the 
  letter 
  

   from 
  Dr. 
  Henry 
  Muhlenberg, 
  written 
  in 
  1809, 
  and 
  containing 
  a 
  list 
  of 
  

   the 
  flora 
  of 
  the 
  District 
  of 
  Columbia 
  had 
  already 
  been 
  purchased 
  by 
  Mr. 
  

   W. 
  L. 
  McAtee. 
  W. 
  W. 
  Diehl 
  spoke 
  of 
  the 
  desirability 
  of 
  making 
  of 
  a 
  list 
  

   of 
  the 
  fungus 
  flora 
  of 
  the 
  District. 
  Mr. 
  Ricker 
  added 
  that 
  a 
  tentative 
  list 
  

   of 
  the 
  mycological 
  flora 
  of 
  the 
  District 
  was 
  now 
  being 
  prepared. 
  

  

  Regular 
  program: 
  

  

  L. 
  R. 
  Jones: 
  Predisposition 
  and 
  resistance 
  to 
  disease 
  in 
  plants. 
  

  

  Plant 
  pathology 
  is 
  now 
  in 
  a 
  transition 
  period. 
  For 
  some 
  time 
  we 
  have 
  been 
  

   talking 
  of 
  disease 
  resistance 
  without 
  getting 
  much 
  nearer 
  to 
  the 
  fundamentals 
  

   underlying 
  this 
  resistance. 
  Such 
  questions 
  must 
  be 
  answered 
  as 
  the 
  par- 
  

   ticular 
  relation 
  of 
  a 
  particular 
  parasite 
  to 
  a 
  plant, 
  the 
  relation 
  of 
  environment 
  

   to 
  resistance, 
  etc. 
  

  

  Much 
  of 
  the 
  work 
  of 
  pathologists 
  has 
  been 
  and 
  still 
  is 
  the 
  search 
  for 
  re- 
  

   sistant 
  strains 
  or 
  varieties 
  of 
  plants 
  to 
  certain 
  diseases. 
  This 
  is 
  a 
  work 
  which 
  

   the 
  geneticist 
  and 
  horticulturist 
  can 
  do 
  far 
  better 
  than 
  the 
  plant 
  pathol- 
  

   ogist. 
  The 
  latter' 
  s 
  particular 
  field 
  is 
  not 
  to 
  search 
  for 
  resistant 
  strains, 
  

   much 
  as 
  this 
  is 
  worth 
  while, 
  but 
  to 
  search 
  for 
  causes 
  of 
  resistance. 
  This 
  

   involves 
  a 
  study 
  of 
  cell 
  pathology, 
  the 
  study 
  of 
  a 
  single 
  parasite 
  and 
  of 
  single 
  

   cells 
  of 
  the 
  host 
  plant. 
  Only 
  a 
  beginning 
  has 
  been 
  made 
  on 
  this 
  fundamental 
  

   work. 
  

  

  