﻿108 
  

  

  circle. 
  If 
  a 
  third 
  pseudopod 
  occurred 
  it 
  commonly 
  started 
  from 
  some 
  

   part 
  of 
  the 
  more 
  convex 
  surface, 
  and 
  was 
  then 
  usually 
  shorter 
  and 
  

   smaller 
  than 
  the 
  other 
  pseudopods. 
  Occasionally, 
  however, 
  a 
  speci- 
  

   men 
  was 
  seen 
  in 
  which 
  this 
  third 
  pseudopod 
  started 
  from 
  one 
  side 
  of 
  

   an 
  ordinary 
  fusiform 
  body 
  or 
  from 
  the 
  shorter 
  side 
  of 
  a 
  curved 
  indi- 
  

   vidual. 
  Not 
  infrequently 
  when 
  a 
  third 
  pseudopod 
  was 
  present 
  it 
  

   was 
  of 
  about 
  the 
  same 
  size 
  as 
  the 
  others, 
  the 
  cell 
  having 
  then 
  a 
  tri- 
  

   angular 
  form, 
  with 
  an 
  acute 
  slender 
  pseudopod 
  from 
  each 
  angle. 
  The 
  

   highly 
  refracting 
  granules 
  already 
  mentioned 
  as 
  mainly 
  tlerived 
  from 
  

   the 
  fatty 
  bodies, 
  and 
  with 
  which 
  the 
  blood 
  of 
  diseased 
  army 
  worms 
  

   was 
  loaded, 
  were 
  very 
  rarely 
  seen 
  imbedded 
  in 
  the 
  substance 
  of 
  these 
  

   amceboid 
  cells. 
  

  

  The 
  third 
  variety 
  of 
  free 
  colls 
  in 
  the 
  fluids 
  of 
  the 
  army 
  worm 
  were 
  

   protoplasmic 
  bodies 
  showing 
  more 
  or 
  less 
  conspicuously 
  a 
  coarse 
  seg- 
  

   mentation 
  within, 
  the 
  segments 
  varying 
  in 
  size 
  in 
  different 
  individ- 
  

   uals 
  and 
  likewise 
  in 
  definiteness 
  and 
  distinctness. 
  These 
  cells 
  always 
  

   contained 
  apparent 
  nuclei, 
  and 
  the 
  segments 
  were 
  sometimes 
  arranged 
  

   in 
  a 
  circular 
  manner 
  around 
  a 
  common 
  center, 
  giving 
  a 
  rosette-like 
  

   appearance 
  to 
  the 
  cell. 
  Some 
  of 
  these 
  segmented 
  protoplasmic 
  bodies 
  

   were 
  spherical, 
  others 
  oval, 
  others 
  oblong, 
  and 
  others 
  almost 
  linear, 
  

   with 
  rounded 
  ends. 
  None 
  were 
  seen 
  with 
  acute 
  extremities. 
  I 
  could 
  

   not 
  trace 
  these 
  to 
  any 
  organ 
  or 
  tissue 
  in 
  the 
  body, 
  and 
  their 
  persist- 
  

   ence 
  in 
  the 
  fluids 
  of 
  dead 
  insects 
  far 
  on 
  the 
  way 
  to 
  disorganization, 
  

   together 
  with 
  their 
  general 
  appearance, 
  suggested 
  a 
  parasitic 
  charac- 
  

   ter. 
  

  

  With 
  these 
  merely 
  descriptive 
  notes 
  I 
  was 
  obliged 
  to 
  content 
  

   myself, 
  not 
  being 
  able 
  under 
  the 
  conditions 
  existing 
  even 
  to 
  deter- 
  

   mine 
  the 
  contagious 
  character 
  of 
  the 
  disease, 
  much 
  less 
  clearly 
  to 
  

   recognize 
  its 
  cause. 
  Its 
  universal 
  prevalence 
  among 
  army 
  worms 
  at 
  

   the 
  time, 
  of 
  course 
  made 
  it 
  impossible 
  to 
  obtain 
  material 
  of 
  that 
  spe- 
  

   cies 
  for 
  infection 
  experiments. 
  A 
  similar 
  condition 
  of 
  things 
  was 
  

   found, 
  however, 
  in 
  a 
  miscellaneous 
  lot 
  of 
  cutworms 
  collected 
  June 
  10 
  

   for 
  experimental 
  use. 
  From 
  sluggish 
  larv;o, 
  motionless 
  except 
  when 
  

   irritated, 
  segmented 
  cells 
  like 
  those 
  last 
  described 
  above 
  were 
  ob- 
  

   tained 
  in 
  great 
  numbers 
  from 
  the 
  blood 
  by 
  snipping 
  ofl' 
  a 
  i)roleg 
  and 
  

   touching 
  a 
  cover-glass 
  to 
  the 
  exuding 
  fluid. 
  In 
  these 
  cutworms, 
  how- 
  

   ever, 
  such 
  cells 
  were 
  commonly 
  oval, 
  sometimes 
  approximating 
  a 
  

   spherical 
  form. 
  They 
  were 
  very 
  abundant 
  in 
  the 
  fatty 
  bodies, 
  as 
  

   were 
  also 
  dark 
  granules 
  reminding 
  one 
  of 
  the 
  peculiar 
  granules 
  of 
  

   the 
  diseased 
  army 
  worms 
  but 
  much 
  larger 
  than 
  these 
  and 
  oval 
  in 
  

   form, 
  like 
  the 
  corpuscles 
  of 
  pebrine. 
  These 
  oval, 
  segmented 
  cells 
  

   varied 
  in 
  transverse 
  diameter 
  from 
  eight 
  to 
  twelve 
  microns, 
  the 
  usual 
  

   diameter 
  being 
  nine 
  and 
  five 
  tenths. 
  Their 
  length 
  varied 
  from 
  10.8 
  

   to 
  14.85 
  microns, 
  the 
  average 
  of 
  those 
  measured 
  being 
  about 
  fifteen. 
  

  

  The 
  importance 
  of 
  this 
  disease 
  as 
  a 
  check 
  upon 
  the 
  multiplication 
  

   of 
  the 
  army 
  worm 
  is 
  shown 
  by 
  the 
  fact 
  that 
  although 
  the 
  very 
  moder- 
  

   ate 
  outbreak 
  reported 
  was 
  that 
  of 
  the 
  first 
  generation 
  of 
  the 
  year, 
  

   there 
  was 
  no 
  appearance 
  whatever 
  of 
  any 
  considerable 
  number 
  of 
  

   army 
  worms 
  of 
  the 
  second 
  generation, 
  either 
  at 
  (^hampaign 
  or 
  in 
  any 
  

   other 
  locality 
  from 
  which 
  this 
  disease 
  was 
  reported 
  to 
  us. 
  It 
  is 
  be- 
  

  

  