﻿PLATE 
  XIY. 
  

  

  Fig. 
  1. 
  — 
  Enlarged 
  view 
  of 
  brain 
  and 
  eye 
  of 
  C. 
  spretus 
  in 
  the 
  second 
  pupal 
  stage 
  ; 
  X 
  £ 
  A. 
  

   This 
  view 
  of 
  the 
  brain 
  is 
  taken 
  from 
  the 
  same 
  preparation 
  (No. 
  10) 
  as 
  Fig. 
  

   1, 
  Plate 
  XV. 
  Centr. 
  o., 
  the 
  central 
  body, 
  showing 
  the 
  two 
  series 
  of 
  cells 
  in 
  

   the 
  lower 
  division 
  and 
  the 
  two 
  rows 
  of 
  unicellular 
  bodies 
  in 
  the 
  superior 
  

   division; 
  ce 
  com. 
  I., 
  oesophageal 
  commissural 
  lobes, 
  with 
  the 
  ball-like 
  masses 
  

   distinctly 
  seen, 
  though 
  this 
  preparation 
  was 
  stained 
  only 
  with 
  picrocar- 
  

   mine, 
  ce. 
  com., 
  oesophageal 
  commissure; 
  opt. 
  nvl., 
  optic 
  nervules; 
  retina, 
  

   retina 
  with 
  rods 
  and 
  cones 
  beyond, 
  the 
  cornea 
  not 
  shown. 
  

  

  Fig. 
  2. 
  — 
  The 
  central 
  body 
  of 
  adult 
  C. 
  spretus, 
  from 
  section 
  17, 
  showing 
  the 
  inferior 
  and 
  

   superior 
  divisions, 
  the 
  cells 
  in 
  inferior 
  division 
  (inf.) 
  and 
  the 
  two 
  rows 
  of 
  

   unicellular 
  bodies 
  (ce. 
  cell. 
  b.) 
  in 
  the 
  superior 
  division 
  (sup). 
  Magnified 
  225 
  

   diameters. 
  

  

  Fig. 
  3. 
  — 
  The 
  central 
  body 
  of 
  the 
  second 
  or 
  last 
  pupal 
  state, 
  from 
  section 
  No. 
  10 
  ; 
  c, 
  cells 
  

   in 
  the 
  fibrous 
  septum 
  between 
  the 
  lower 
  and 
  upper 
  divisions 
  of 
  the 
  central 
  

   body, 
  from 
  section 
  No. 
  11. 
  X 
  225 
  diameters. 
  

  

  Fig. 
  4. 
  — 
  Vertical 
  section 
  of 
  the 
  subcesophageal 
  ganglion 
  of 
  the 
  cockroach 
  (Blaiia 
  

   orientalis), 
  showing 
  the 
  commissure 
  on 
  the 
  left 
  side. 
  

  

  Fig. 
  5. 
  — 
  A 
  section 
  farther 
  behind, 
  showing 
  the 
  back 
  of 
  the 
  ganglion 
  (gang.), 
  seen 
  

   separate 
  from 
  the 
  commissure 
  (com). 
  

  

  Fig. 
  6. 
  — 
  A 
  section 
  through 
  the 
  commissure 
  j 
  ust 
  behind 
  the 
  ganglion. 
  

   All 
  the 
  sections 
  represented 
  on 
  this 
  plate 
  were 
  stained 
  with 
  picrocarmine. 
  

  

  