﻿16 
  MALLET 
  : 
  VOLCANOES 
  OF 
  BARREN 
  ISLAND 
  AND 
  NAROONDAM, 
  

  

  the 
  volcano 
  a 
  few 
  years 
  later, 
  says, 
  and 
  I 
  believe 
  quite 
  correctly, 
  tEat 
  

   " 
  there 
  are 
  no 
  appearances 
  of 
  any 
  recent 
  elevation 
  of 
  the 
  island." 
  * 
  The 
  

   same 
  opinion 
  was 
  also 
  arrived 
  at 
  by 
  Dr. 
  Playfair. 
  2 
  The 
  stratum 
  mentioned 
  

   by 
  Dr. 
  Liebig 
  does 
  differ 
  markedly 
  from 
  the 
  present 
  beach 
  deposit, 
  in 
  that 
  

   the 
  latter 
  contains 
  numerous 
  worn 
  fragments 
  of 
  shell 
  and 
  coral, 
  while 
  

   none 
  such 
  were 
  observable 
  in 
  the 
  former. 
  I 
  think 
  the 
  stratum 
  in 
  ques- 
  

   tion 
  is 
  undoubtedly 
  non-marine, 
  and, 
  considering 
  how 
  closely 
  air-sorted 
  

   volcano 
  ejecta 
  sometimes 
  simulate 
  those 
  sorted 
  by 
  water, 
  it 
  is 
  question- 
  

   able 
  whether 
  the 
  stratum 
  is 
  aqueous 
  at 
  all. 
  3 
  If 
  any 
  elevation 
  of 
  the 
  

   island 
  had 
  occurred 
  in 
  recent 
  times, 
  it 
  would 
  almost 
  certainly 
  have 
  left 
  

   unmistakeable 
  evidences, 
  such 
  as 
  are 
  to 
  be 
  found 
  so 
  abundantly 
  on 
  the 
  

   shores 
  of 
  Ramri 
  and 
  Cheduba, 
  off 
  the 
  coast 
  of 
  Arakan. 
  4 
  

  

  The 
  central 
  cone 
  rises 
  to 
  an 
  elevation 
  of 
  rather 
  more 
  than 
  1,000 
  feet 
  

  

  above 
  the 
  sea-level 
  5 
  or 
  900 
  feet 
  from 
  its 
  western 
  

   The 
  central 
  cone. 
  

  

  foot. 
  Where 
  the 
  sides 
  are 
  composed 
  entirely 
  of 
  

  

  scoriae, 
  ash, 
  and 
  loose 
  ejected 
  blocks, 
  the 
  slope 
  is 
  almost 
  perfectly 
  uniform 
  

  

  throughout, 
  at 
  an 
  angle 
  of 
  about 
  32°. 
  In 
  places, 
  however, 
  where 
  streams 
  

  

  of 
  lava 
  have 
  poured 
  down, 
  the 
  inclination 
  is 
  more 
  irregular. 
  On 
  the 
  

  

  lower 
  portion 
  of 
  the 
  slope 
  the 
  fragmentary 
  ejecta 
  are 
  loose, 
  but 
  near 
  

  

  the 
  top 
  they 
  are 
  cemented 
  together 
  into 
  a 
  friable 
  mass, 
  which, 
  near 
  the 
  

  

  edge 
  of 
  the 
  crater, 
  is 
  divided 
  by 
  numerous 
  cracks 
  up 
  to 
  a 
  foot 
  in 
  width. 
  

  

  Dr. 
  Liebig 
  states 
  that 
  the 
  cementing 
  material 
  is 
  gypsum 
  : 
  probably 
  it 
  is 
  

  

  so 
  in 
  part, 
  gypsum 
  being 
  a 
  common 
  mineral 
  about 
  the 
  crater, 
  but 
  two 
  

  

  samples 
  of 
  ash 
  from 
  different 
  spots, 
  that 
  I 
  brought 
  away, 
  were 
  found 
  to 
  

  

  contain 
  no 
  sulphate 
  of 
  lime, 
  and 
  appeared 
  to 
  be 
  agglutinated 
  by 
  a 
  siliceous 
  

  

  cement. 
  

  

  1 
  Proceedings, 
  Roy. 
  Geog. 
  Soc, 
  1862, 
  p. 
  216. 
  

  

  2 
  Selections, 
  Records, 
  Govt, 
  of 
  India 
  (Home 
  Dept.), 
  No. 
  XXV, 
  p. 
  123. 
  

  

  3 
  Vide 
  V 
  . 
  11. 
  

  

  Records, 
  Geol. 
  Surv. 
  India, 
  Vol. 
  XI, 
  p. 
  190. 
  

   5 
  Captain 
  Blair, 
  as 
  quoted 
  by 
  Colebrooke, 
  gives 
  the 
  elevation 
  as 
  nearly 
  1,800 
  feet, 
  an 
  

   evident 
  mistake 
  (probably 
  misprint), 
  as 
  be 
  says 
  that 
  the 
  cone 
  is 
  of 
  the 
  same 
  height 
  as 
  " 
  the 
  

   other 
  parts 
  of 
  the 
  island," 
  and 
  Test's 
  sketch 
  (vide 
  p. 
  12) 
  represents 
  the 
  elevation, 
  compared 
  

   to 
  that 
  of 
  the 
  surrounding 
  ring, 
  as 
  not 
  appreciably 
  different 
  to 
  what 
  it 
  is 
  at 
  the 
  present 
  

   time. 
  See 
  also 
  V. 
  Ball, 
  Records, 
  G. 
  S. 
  I., 
  VI, 
  p. 
  82. 
  

  

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