﻿638 
  NEW 
  yore: 
  state 
  museum 
  

  

  The 
  range 
  of 
  constitutents 
  in 
  brick 
  clays 
  from 
  various 
  states 
  can 
  

   be 
  seen 
  from 
  tbe 
  following 
  table. 
  

  

  North 
  Carolina 
  

  

  Range 
  Average 
  

  

  Silica 
  ,52 
  — 
  70 
  60^ 
  

  

  Alumina 
  .13 
  —28 
  18^ 
  

  

  Ferric 
  oxid 
  1.6 
  — 
  11.6 
  60^ 
  

  

  Lime 
  1— 
  2.5 
  .60^ 
  

  

  Magnesia 
  1 
  — 
  1.6 
  . 
  40^ 
  

  

  Alkalis 
  2— 
  4.5 
  W^ 
  

  

  Water 
  4 
  — 
  12 
  7^ 
  

  

  Total 
  flukes 
  3.5 
  — 
  17.5 
  9^ 
  

  

  Missouri 
  

  

  Range 
  Average 
  

  

  Silica 
  and 
  fluxes 
  combined.. 
  12 
  — 
  30' 
  15^ 
  

  

  Silica 
  (sand) 
  20 
  — 
  60 
  55^ 
  

  

  Alumina 
  11 
  — 
  25 
  14^ 
  

  

  Water 
  (combined) 
  3 
  — 
  9 
  4:^ 
  

  

  Water 
  (moisture) 
  — 
  6 
  2^ 
  

  

  Perric 
  oxid 
  . 
  2.5 
  — 
  8 
  4^ 
  

  

  lime 
  5 
  — 
  7 
  1.50^ 
  

  

  Magnesia 
  3 
  — 
  8 
  1^ 
  

  

  Alkalis 
  2 
  — 
  7 
  S.60fc 
  

  

  New 
  Yorh 
  

  

  Range 
  Average 
  

  

  Silica 
  46.12 
  — 
  69.73 
  64.28^ 
  

  

  Alumina 
  11.33 
  — 
  24.45 
  18.81^ 
  

  

  Ferric 
  oxid 
  1.90—10.90 
  5.92^ 
  

  

  Lime 
  23 
  — 
  15.38 
  4.87^ 
  

  

  Magnesia 
  10— 
  8.24 
  2.95^ 
  

  

  Alkalis 
  . 
  . 
  . 
  . 
  .^ 
  48 
  — 
  9.82 
  5.43^ 
  

  

  Water 
  * 
  90 
  — 
  12.67 
  6.906^ 
  

  

  Moisture 
  4.50— 
  8.26 
  5.41j^ 
  

  

  