CRAB  ORCHARD  SALTS. 
239 
"  Sowder's  Springs  yields  two  hundred  gallons  of  water  a  day. 
Specific  gravity,  1.006. 
One  thousand  grains  of  the  water,  evaporated  to  dryness  at 
212°,  left  7.153  grains  of  saline  matter,  which  was  composed  of 
the  following  salts : 
GRAINS. 
0.506  )  held  in  solution 
.375  j  by  carbonic  acid 
Carbonate  of  Lime 
"  Magnesia 
H  Iron 
Sulphate  of  Magnesia 
"  Lime 
"  Potassa 
"  Soda 
Chloride  Sodium 
Silica 
Bromine 
a  trace 
2.989 
1.566 
.298 
.398 
1.000 
.021 
a  trace 
7.153 
The  amount  of  free  carbonic  acid  was  not  estimated, 
CRAB  ORCHARD  SALTS. 
The  salts  left  by  the  evaporation  of  the  water  of  this  spring? 
constitute  a  moist,  grarular  powder,  with  a  slight  brownish 
tinge,  scarcely  distinguishable  from  Havana  sugar  in  appear- 
ance.   Per  centage  comparative  as  follows  : 
R  Sulphate  of  Magnesia,  .         .  63.19 
Sulphate  of  Soda,  .  .  4.20 
Sulphate  of  Potassa,  .         .  1.80 
Sulphate  of  Lime,  .         .  2.54 
Chloride  of  Sodium,  .  .  4.77 
Carbonates  of  Lime,  Magnesia,  Iron  and 
Silica,  .  .89 
Bromine,  .  .  a  trace, 
Water  of  Crystallization  a  loss,        .  22.61 
Total,  .  ...  110.00 
This  salt  was  obtained  by  boiling  down  the  water  in  an  iron 
kettle  to  a  certain  density,  and  then,  after  allowing  it  to  stand 
for  some  time  in  a  wooden  vessel,  the  clear  liquid  drawn  off 
from  the  mixed  deposit  of  carbonates  lime,  magnesia  and  oxide 
of  iron,  thrown  down  by  boiling,  was  evaporated  to  full  dryness. 
Much  of  the  Crab  Orchard  salt  sold  in  Louisville  has  the  ap- 
