5o6  Analysis  of  Iodine-Iron  Coddver  OiL   {  ""  (.^'iso""'" 
o'09i35  Phosphoric  acid 
o'oyioo  Sulphuric  acid 
o'l 5 1 50  Lime 
o'oo88o  Magnesia 
0*05540  Soda 
Total  0  37805  per  cent,  inorganic  matter  or 
o'32265  per  cent,  incombustible  ingredients,  if  the  soda, 
which  may  be  volatilized  as  chloric  natrium,  is  not  counted. 
What  was,  however,  the  result  of  a  direct  experiment,  the  burniug 
in  a  platinum  cup  Nothing  more  or  less  than  this — a  quantity  of  no 
less  than  35  grams  of  light-colored  cod  liver  oil  left  no  weighable  quan- 
tity of  ash. 
These  experiments  have  often  been  made  with  the  light-colored 
Lofodin  cod  liver  oil  of  Draisma  Van  Valkenburg,  and  generally 
crowned  with  the  same  success. 
Likewise  other  sorts  of  cod  liver  oil  produced  the  same  results.  For 
instance,  23*867  grams  of  an  English  oil  that  was  very  pure,  left  0*0005 
gram  of  a  light  brown  ash,  in  which  iron,  but  hardly  any  calcium, 
could  be  distinguished  ;  accordingly  O'OOl  per  cent. 
22*408  grams  of  Dr.  de  Jongh's  oil,  which  is  darker  than  the  two 
sorts  mentioned  above,  left  0*002  gram  of  ash,  in  which  iron  and  cal- 
cium were  distinguishable  ;  accordingly  0*009  per  cent. 
Hence  it  may  be  safely  stated  that  light-colored  cod  liver  oil  con- 
tains hardly  any  or  no  incombustible  matter. 
How,  then,  are  the  results  of  Dr.  de  Jongh's  experiments  to  be 
accounted  for  Inasmuch  as  this  phosphoric  acid,  calcium,  etc.,  have 
really  been  found  in  an  analysis,  they  can  only  have  originated  from 
the  vessels  or  the  reagents  that  were  used,  a  warning  example,  no  doubt, 
that  one  cannot  be  too  scrupulously  accurate  in  ascertaining  the  recti- 
tude of  the  results  that  one  has  acquired  through  analysis. — Pharm. 
Jour,  and  Trans. ^  Sept.  4,  1880. 
ANALYSIS  OF  IODINE-IRON  CODLIVER  OIL.^ 
By  Professor  E.  A.  Van  der  Burg. 
From  the  above  it  is  evident  that  the  light-colored  cod  liver  oil  after 
combustion  leaves  no  weighable  quantity  of  ash.  The  quantity  of  iron 
may  be  found  by  burning  at  least  20  grams  in  a  small  porcelain  or  pla- 
tinum cup,  and  weighing  the  iron  oxide  that  is  in  that  way  produced. 
^  The  method  of  making  this  preparation  is  described  below. 
