532  IODINE  FROM  THE  ASHES  OF  SEA-WEEDS. 
To  resume  our  estimate  of  products,  the  following  tabular 
view  will  render  it  more  clearly  : 
9000  ton  ^  9  lbs.    iodine  per  ton,  81,000  pounds, 
kelp     1 500  lbs.  chl.  of  pot.  per  ton,        4,500,000  « 
yielding,  J  150  lbs.  sulph.  of  potash  per  ton,  1,250,000  " 
300  lbs.  mixed  carbonate,  muri- 1 
ate  and  sulphate  of  soda,  called  V  2,700,000  " 
by  the  trade  kelp  salt,  J 
This  shows  upwards  of  2,600  tons  of  salts  of  potash  introduced 
into  the  British  market  annually,  incident  to  the  manufacture  of 
iodine.  These  are  almost  wholly  consumed  by  the  alum  makers, 
and  sell  generally  at  about  $50  per  ton.  From  the  cheapness 
of  socla  in  Britain,  the  mixed  carbonate  and  sulphate  of  that  salt 
are  difficult  of  sale,  seldom  bringing  more  than  §6  per  ton ;  but 
in  the  United  States  they  might  be  wholly  used  up  to  advantage 
in  the  soap  manufacture,  all  the  soda  salts  used  for  that  purpose 
being  imported. 
The  insoluble  residuum  which  remains  after  the  exhaustion  of 
the  soluble  contents  of  the  kelp,  and  which  amounts  to  about 
one  half  the  original  weight,  when  mixed  with  sand,  is  the  uni- 
versal flux  used  by  the  glass  bottle  makers  in  Scotland.  The 
price  generally  paid  is  $1  per  ton  ;  the  trade  name  for  this  re- 
siduum, which  is  a  mixed  silicate  of  soda  and  potash  with  various 
impurities,  is  kelp  waste. 
This  then  exhausts  the  number  and  quantities  of  the  products 
incident  to  the  manufacture  of  iodine  from  the  incinerated 
ashes  of  sea  weed,  so  that  if  we  calculate  the  two  French  estab- 
lishments to  be  equal  to  two  medium  Scotch  in  their  consumption 
and  product,  the  following  table  will  be  a  very  near  approxi- 
mation to  the  annual  products  and  money  value  of  the  trade : 
Products  of  Iodine. 
Scotland  and  Ireland,    81,000  lbs. 
France,     .       .       .    19,000  lbs.    100,000  lbs.    $3.00  $300,000 
Chloride  and  Sulphate  of  Potash. 
Scotland  and  Ireland,     2,600  tons. 
France,     ...        500  "       3,100  tons.    $50  per  ton.  155,000 
Soda  Salts. 
Scotland  and  Ireland,     1,350  tons. 
France,     ...        300  "      1,650 tons.    $6.00perton.  9,900 
