﻿GEOLOGY. 
  227 
  

  

  Yellow 
  ochre 
  is 
  also 
  frequently 
  found 
  below 
  the 
  dilu- 
  

   vial 
  gravel, 
  generally 
  covered 
  with 
  a 
  lamina 
  of 
  hard 
  

   pan 
  or 
  thin 
  crust 
  of 
  conglomerate, 
  and 
  sometimes 
  con- 
  

   taining 
  iron 
  in 
  botroidal 
  and 
  dendritic 
  forms. 
  

  

  It 
  occurs 
  at 
  the 
  White 
  Cliffs 
  very 
  pure 
  and 
  in 
  large 
  

   quantity, 
  but 
  is 
  only 
  exposed 
  at 
  extreme 
  low 
  water. 
  

   During 
  the 
  embargo 
  which 
  preceded 
  the 
  war 
  of 
  1812, 
  

   two 
  ships 
  from 
  Boston 
  were 
  loaded 
  with 
  it 
  from 
  that 
  

   place. 
  

  

  Used 
  as 
  a 
  pigment, 
  it 
  combines 
  readily 
  with 
  oil 
  or 
  

   water; 
  and 
  when 
  burnt 
  gives 
  a 
  Hvely 
  red 
  color. 
  

  

  On 
  the 
  lands 
  of 
  Dr. 
  White, 
  Section 
  35, 
  Township 
  3, 
  

   Range 
  3 
  W, 
  in 
  Hinds 
  County, 
  my 
  attention 
  was 
  called 
  

   to 
  a 
  mineral 
  earth 
  occupying 
  a 
  spot 
  of 
  small 
  extent 
  on 
  

   the 
  surface, 
  to 
  which 
  stock 
  of 
  all 
  kinds 
  resorted 
  for 
  the 
  

   salts 
  which 
  it 
  seems 
  to 
  contain, 
  and 
  which 
  they 
  lick 
  or 
  

   eat 
  freely, 
  and 
  all 
  with 
  impunity 
  except 
  the 
  hog, 
  which 
  

   is 
  said 
  to 
  be 
  destroyed 
  by 
  the 
  use 
  of 
  it. 
  

  

  Dr. 
  White 
  has 
  observed 
  that 
  it 
  has 
  the 
  effect 
  of 
  chang- 
  

   ing 
  the 
  skin 
  of 
  the 
  hog 
  to 
  a 
  red 
  color; 
  that 
  the 
  carrion 
  

   crow 
  seems 
  to 
  reject 
  the 
  carcass, 
  which 
  resists 
  putrefac- 
  

   tion 
  to 
  a 
  considerable 
  degree, 
  and 
  dries 
  up, 
  and 
  cures, 
  as 
  

   animal 
  matter 
  is 
  said 
  to 
  do 
  in 
  some 
  parts 
  of 
  Mexico. 
  

  

  Other 
  deposits 
  of 
  similar 
  character 
  have 
  frequently 
  

   been 
  met 
  with 
  of 
  limited 
  extent. 
  They 
  are 
  generally 
  

   entirely 
  destitute 
  of 
  vegetation, 
  and 
  in 
  their 
  natural 
  

   state 
  neither 
  corn 
  nor 
  cotton 
  will 
  grow 
  upon 
  them. 
  

  

  The 
  application 
  of 
  cotton 
  seed 
  and 
  a 
  crop 
  of 
  pea 
  vine 
  

   renders 
  them 
  temporarily 
  productive, 
  and 
  the 
  growing 
  

   crop, 
  when 
  so 
  improved, 
  has 
  been 
  observed 
  to 
  resist 
  the 
  

   drought 
  in 
  a 
  remarkable 
  degree. 
  

  

  Many 
  of 
  our 
  streams 
  are 
  characterized 
  by 
  the 
  great 
  

   deposit 
  of 
  fine 
  white 
  sand 
  which 
  they 
  afford. 
  

  

  Pearl, 
  Leaf, 
  and 
  Chickasaw 
  Rivers, 
  in 
  some 
  parts 
  of 
  

  

  