﻿GEOLOGY. 
  221 
  

  

  fragments 
  of 
  the 
  rock, 
  and 
  piled 
  up 
  so 
  as 
  to 
  form 
  a 
  mound 
  

   supposed 
  to 
  be 
  one 
  of 
  the 
  monumental 
  tumuli 
  of 
  the 
  

   aborigines, 
  and 
  similar 
  in 
  character 
  to 
  the 
  Cairns 
  of 
  

   Scotland. 
  

  

  The 
  formation 
  of 
  these 
  fulgorites 
  has 
  been 
  attributed 
  

   to 
  lightning. 
  

  

  Under 
  favorable 
  circumstances, 
  these 
  ferruginous 
  con- 
  

   glomerates 
  are 
  continually 
  forming. 
  An 
  old 
  horseshoe, 
  

   or 
  any 
  scrap 
  of 
  iron 
  cast 
  by 
  chance 
  in 
  coarse 
  sand 
  or 
  

   gravel, 
  particularly 
  if 
  intermixed 
  with 
  soil 
  containing 
  

   calcareous 
  matter, 
  soon 
  forms 
  a 
  concrete, 
  and 
  illustrates 
  

   the 
  chemical 
  affinity 
  by 
  which 
  the 
  particles 
  coalesce. 
  

  

  Iron, 
  which 
  enters 
  largely 
  into 
  the 
  composition 
  of 
  the 
  

   matrix, 
  at 
  least, 
  is 
  one 
  of 
  the 
  most 
  generally 
  diffused 
  of 
  

   all 
  solid 
  minerals. 
  It 
  forms 
  a 
  constituent 
  part 
  of 
  many 
  

   animal 
  and 
  vegetable 
  substances, 
  and 
  is 
  also 
  deposited 
  

   from 
  chalybeate 
  waters. 
  

  

  And 
  here, 
  it 
  may 
  as 
  well 
  be 
  menti(med 
  in 
  what 
  other 
  

   forms 
  it 
  is 
  found 
  to 
  exist 
  in 
  the 
  State. 
  

  

  Besides 
  the 
  pisiform 
  or 
  argillaceous 
  oxide 
  occurring 
  

   occasionally 
  in 
  certain 
  soils 
  in 
  considerable 
  amount, 
  of 
  

   no 
  appreciable 
  value, 
  but 
  rather 
  a 
  pernicious 
  ingredient, 
  

   injurious 
  to 
  most 
  crops, 
  the 
  bog 
  ore, 
  which 
  is 
  attributed 
  

   by 
  mineralogists 
  to 
  vegetable 
  depositions, 
  exists 
  in 
  many 
  

   situations, 
  generally 
  in 
  the 
  wet 
  bottoms 
  of 
  watercourses, 
  

   w^here 
  the 
  earth 
  is 
  of 
  that 
  whitish, 
  tenacious 
  description 
  

   usually 
  characterized 
  as 
  Crawfish 
  land. 
  It 
  has 
  been 
  

   met 
  with 
  on 
  the 
  Amite, 
  Pearl, 
  and 
  Leaf 
  Rivers, 
  and 
  

   doubtless 
  exists 
  in 
  many 
  similar 
  situations. 
  That 
  on 
  

   Leaf 
  River 
  is 
  said, 
  by 
  a 
  gentleman 
  practically 
  ac- 
  

   quainted 
  with 
  the 
  subject, 
  to 
  compare 
  favorably 
  with 
  

   similar 
  ore 
  worked 
  in 
  New 
  Jersey. 
  

  

  A 
  mile 
  or 
  two 
  west 
  of 
  the 
  residence 
  of 
  Mr. 
  Frederick 
  

   Braugher, 
  in 
  Tippah 
  County, 
  a 
  conglomerate 
  or 
  pudding- 
  

  

  