﻿76 
  

  

  Miller: 
  The 
  wood 
  of 
  Machaerium 
  Whitfordit 
  

  

  marki 
  

  

  between 
  

  

  two 
  vessels 
  are 
  alternate, 
  that 
  is, 
  in 
  diagonal 
  rows, 
  and 
  rarely 
  so 
  

   crowded 
  as 
  to 
  give 
  a 
  hexagonal 
  outline 
  to 
  the 
  border. 
  The 
  width 
  

   of 
  these 
  pits 
  averages 
  about 
  45 
  ju, 
  while 
  that 
  of 
  the 
  pit 
  mouth, 
  

   which 
  is 
  narrowly 
  elliptical, 
  is 
  about 
  30 
  /x 
  (FiG. 
  3)- 
  Pits 
  in 
  trans- 
  

   verse 
  section 
  show 
  rather 
  long 
  and 
  narrow 
  canals, 
  which 
  widen 
  

  

  / 
  

  

  Fig. 
  2, 
  Detail 
  of 
  a 
  portion 
  of 
  cross-section 
  greatly 
  enlarged 
  showing 
  vessels 
  

  

  solitary 
  

  

  rays 
  with 
  gummy 
  contents; 
  wood 
  fibres, 
  thick-walled 
  and 
  irregularly 
  disposed. 
  

   The 
  bordered 
  pits 
  between 
  vessels 
  have 
  slit-like 
  mouths 
  which, 
  in 
  cross-section, 
  are 
  

   almost 
  as 
  wide 
  as 
  the 
  pit 
  membranes. 
  

  

  middle 
  lamella 
  

  

  metimes 
  

  

  especially 
  

  

  segments 
  

  

  th 
  

  

  opposite 
  sides 
  of 
  the 
  wall 
  are 
  seen 
  to 
  overlap 
  slightly 
  at 
  the 
  ends 
  

   into 
  what 
  looks 
  like 
  a 
  continuous 
  slit. 
  In 
  surface 
  view 
  the 
  pit 
  

  

  