﻿8 
  MALLET 
  : 
  VOLCANOES 
  OP 
  BARREN 
  ISLAND 
  AND 
  NAROONDAM. 
  

  

  surface 
  of 
  the 
  inner 
  cone. 
  The 
  longest 
  radii 
  from 
  the 
  centre 
  of 
  the 
  crater 
  to 
  

   the 
  coast 
  (i.e., 
  those 
  to 
  the 
  points 
  where 
  the 
  island 
  has 
  been 
  least 
  encroached 
  

   upon 
  by 
  subsidence 
  or 
  denudation) 
  measure 
  just 
  7,000 
  feet. 
  Taking, 
  then, 
  

   this 
  as 
  a 
  base-line 
  and 
  25° 
  as 
  the 
  slope, 
  we 
  should 
  arrive 
  at 
  an 
  altitude 
  of 
  

   about 
  3,300 
  feet. 
  Some 
  deduction 
  must 
  be 
  made 
  from 
  this 
  height 
  on 
  

   account 
  of 
  the 
  truncation 
  of 
  the 
  cone 
  by 
  the 
  crater, 
  but 
  this 
  is 
  probably 
  

   more 
  than 
  counterbalanced 
  by 
  the 
  reduction 
  in 
  diameter 
  which 
  the 
  island 
  

   has 
  undergone 
  through 
  pluvial 
  and 
  marine 
  denudation, 
  — 
  that 
  is 
  to 
  say, 
  the 
  

   reduction 
  of 
  the 
  base-line 
  from 
  which 
  the 
  vertical 
  line 
  is 
  calculated. 
  1 
  

  

  From 
  what 
  depth 
  of 
  water 
  the 
  volcano 
  rises 
  is 
  not 
  known. 
  Captain 
  

   Depth 
  from 
  which 
  the 
  Miller 
  found 
  no 
  bottom 
  " 
  close 
  under 
  the 
  rock 
  " 
  at 
  

   volcaHorises. 
  1 
  20 
  fathoms, 
  2 
  while 
  Captain 
  Blair 
  say 
  s 
  that 
  "a 
  

  

  quarter 
  of 
  a 
  mile 
  from 
  the 
  shore 
  there 
  is 
  no 
  ground 
  with 
  150 
  fathoms 
  

   of 
  line. 
  " 
  8 
  Dr. 
  Mouat 
  has 
  recorded 
  that 
  " 
  in 
  the 
  immediate 
  neighbour- 
  

   hood 
  of 
  the 
  shore, 
  the 
  water 
  was 
  found 
  to 
  be 
  very 
  deep. 
  Even 
  at 
  the 
  

   depth 
  of 
  three 
  or 
  four 
  hundred 
  fathoms 
  no 
  bottom 
  could 
  be 
  felt. 
  Captain 
  

   Campbell 
  himself 
  afterwards 
  gave 
  orders 
  for 
  the 
  renewal 
  of 
  the 
  attempt, 
  

   and 
  at 
  a 
  considerably 
  greater 
  depth 
  the 
  lead 
  met 
  the 
  resistance 
  of 
  a 
  

   solid 
  substratum. 
  " 
  * 
  On 
  the 
  chart 
  of 
  the 
  Bay 
  of 
  Bengal 
  published 
  by 
  

   the 
  Marine 
  Survey 
  Department 
  (1879) 
  several 
  soundings 
  are 
  given 
  from 
  

   Barren 
  Island 
  northwards 
  towards 
  Narcondam, 
  and 
  south-westwards 
  

  

  1 
  It 
  is 
  unnecessary 
  to 
  take 
  into 
  account 
  the 
  increase 
  in 
  diameter 
  which 
  the 
  island 
  may 
  

   have 
  undergone 
  as 
  a 
  consequence 
  of 
  the 
  explosive 
  eruption, 
  through 
  the 
  falliDg 
  of 
  loose 
  

   material 
  on 
  the 
  lower 
  slopes, 
  as 
  this 
  has 
  long 
  since 
  been 
  washed 
  away 
  again. 
  

  

  2 
  Cal. 
  Jour. 
  Nat. 
  Hist., 
  Ill, 
  p. 
  422. 
  

   8 
  Asiatic 
  Researches, 
  IV, 
  p. 
  398. 
  

  

  4 
  Adventures 
  and 
  researches 
  amongst 
  the 
  Andaman 
  Islanders, 
  page 
  153. 
  It 
  is 
  to 
  be 
  

   regretted 
  that 
  the 
  exact 
  distance 
  from 
  shore, 
  and 
  the 
  depth 
  of 
  Captain 
  Campbell's 
  soundings 
  

   were 
  not 
  placed 
  on 
  record. 
  It 
  would 
  appear 
  from 
  the 
  context 
  that 
  he 
  was 
  not 
  sounding 
  for 
  

   any 
  scientific 
  object, 
  but 
  merely 
  in 
  search 
  of 
  an 
  anchorage, 
  and 
  under 
  such 
  circumstances 
  it 
  

   appears 
  very 
  extraordinary 
  that 
  the 
  lead 
  should 
  have 
  been 
  lowered 
  to 
  such 
  a 
  depth. 
  One 
  

   cannot 
  but 
  suspect 
  that 
  there 
  is 
  some 
  mistake, 
  especially 
  as 
  if 
  the 
  depth 
  is 
  so 
  great 
  in 
  the 
  

   immediate 
  neighbourhood 
  of 
  the 
  shore, 
  the 
  submarine 
  slopes 
  of 
  the 
  island 
  must 
  be 
  far 
  steeper 
  

   than 
  those 
  above 
  the 
  sea-level. 
  Captain 
  Campbell 
  subsequently 
  obtained 
  soundings 
  of 
  4J 
  to 
  

   14 
  fathoms 
  on 
  the 
  south-west 
  side 
  of 
  the 
  island 
  i 
  mile 
  from 
  the 
  shore 
  (I. 
  c, 
  page 
  157, 
  and 
  

   Selections 
  from 
  Eecords 
  of 
  the 
  Government 
  of 
  India 
  (Home 
  Department), 
  XXV, 
  page 
  

   124). 
  This 
  is 
  the 
  spot 
  where 
  the 
  anchorage 
  is 
  marked 
  on 
  Captain 
  Hobday's 
  map, 
  and 
  where 
  

   the 
  ' 
  Celerity 
  ' 
  rode 
  during 
  our 
  visit. 
  

  

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