﻿390 
  C. 
  E. 
  Munroe 
  — 
  Sand 
  Fusions 
  from 
  Gun 
  Cotton. 
  

  

  charge 
  was 
  fired 
  and 
  each 
  then 
  contained 
  burning 
  gun 
  cotton. 
  

   It 
  is 
  believed 
  that 
  each 
  fusion 
  figure 
  was 
  formed 
  about 
  a 
  wet 
  

   disk 
  of 
  the 
  gun 
  cotton 
  and 
  is 
  a 
  cast 
  of 
  the 
  partly 
  burned 
  disk. 
  

   They 
  are 
  shown 
  in 
  the 
  photograph 
  where 
  No. 
  1 
  is 
  a 
  disk 
  of 
  

   such 
  gun 
  cotton 
  as 
  was 
  used 
  originally. 
  It 
  measured 
  3*5 
  inches 
  

   in 
  diameter 
  by 
  2 
  inches 
  in 
  height. 
  The 
  sand 
  fusions 
  are 
  num- 
  

   bered 
  2, 
  3 
  and 
  4 
  in 
  the 
  photograph. 
  They 
  were 
  coated 
  on 
  the 
  

  

  interior 
  with 
  a 
  greyish 
  glaze 
  not 
  over 
  a 
  millimeter 
  in 
  thickness 
  

   to 
  the 
  exterior 
  of 
  which 
  grains 
  of 
  sand 
  was 
  adherent. 
  They 
  at 
  

   once 
  on 
  appearance 
  suggested 
  fulgurites, 
  but 
  as 
  a 
  fulgurite 
  has 
  

   been 
  defined 
  as 
  " 
  a 
  vertical 
  tube 
  with 
  fused 
  w 
  T 
  alls 
  formed 
  in 
  

   sand, 
  rarely 
  in 
  compact 
  rock, 
  by 
  the 
  passage 
  of 
  lightning," 
  

   these 
  may 
  simply 
  be 
  styled 
  sand 
  fusions 
  produced 
  by 
  the 
  burn- 
  

   ing 
  of 
  wet 
  compressed 
  pulped 
  military 
  gun 
  cotton 
  in 
  sand 
  

   impregnated 
  with 
  sea 
  salts. 
  

  

  George 
  Washington 
  University, 
  

   Washington, 
  D. 
  C. 
  

  

  