﻿388 
  JOURNAL 
  OF 
  THE 
  WASHINGTON 
  ACADEMY 
  OF 
  SCIENCES 
  VOL. 
  12, 
  NO. 
  17 
  

  

  molecules 
  present.^ 
  I 
  have 
  not 
  yet 
  had 
  the 
  opportunity 
  to 
  study 
  

   the 
  material 
  chemically 
  or 
  with 
  the 
  microscope. 
  It 
  is 
  what 
  appears 
  

   to 
  be 
  the 
  jade 
  most 
  valued 
  among 
  the 
  Maya. 
  

  

  Dr. 
  Morley 
  informs 
  me 
  that 
  "the 
  nearest 
  monument 
  to 
  these 
  

   objects 
  is 
  Stela 
  7, 
  recording 
  the 
  date 
  9. 
  9. 
  ().().(). 
  of 
  the 
  Maya 
  Era, 
  

   or 
  354 
  A. 
  D. 
  These 
  jades, 
  however, 
  probably 
  date 
  from 
  a 
  century 
  

   to 
  a 
  century 
  and 
  a 
  half 
  later." 
  

  

  Fig. 
  1. 
  Worked 
  jade 
  pebble; 
  Copan, 
  Honduras. 
  A 
  on 
  the 
  right, 
  B 
  on 
  left. 
  

  

  The 
  two 
  pieces 
  are 
  not 
  quite 
  the 
  same 
  size 
  or 
  weight, 
  but 
  they 
  are 
  

   unquestionably 
  parts 
  of 
  the 
  same 
  pebble. 
  Their 
  general 
  form 
  is 
  

   shown 
  in 
  fig. 
  1. 
  The 
  greatest 
  length 
  is 
  about 
  7.6 
  cm., 
  the 
  greatest 
  

   width 
  (B) 
  5.2 
  and 
  (A) 
  5.5 
  cm., 
  while 
  the 
  smaller 
  (A) 
  is 
  about 
  5 
  cm. 
  

   in 
  greatest 
  thickness 
  and 
  the 
  larger 
  (B) 
  about 
  1.2. 
  The 
  perforation 
  

   is 
  circular 
  and 
  of 
  the 
  same 
  diameter 
  in 
  each, 
  3.3 
  cm. 
  The 
  smaller 
  

   (A) 
  weighed 
  37 
  . 
  3062 
  grams 
  (before 
  the 
  piece, 
  weighing 
  about 
  3 
  grams, 
  

   was 
  removed 
  by 
  me), 
  and 
  the 
  larger 
  (B) 
  weighs 
  55.8190 
  grams. 
  

  

  The 
  curved 
  surfaces 
  are 
  those 
  of 
  the 
  original 
  pebble; 
  they 
  are 
  

   water-smoothed, 
  but 
  not 
  polished. 
  In 
  color 
  the 
  smaller 
  piece 
  (that 
  

  

  '' 
  See 
  a 
  forthcoming 
  paper 
  on 
  The 
  jades 
  of 
  Middle 
  America, 
  to 
  be 
  published 
  in 
  Proc. 
  

   Nat. 
  Acad, 
  for 
  1922. 
  

  

  