AnVa0rcii;li89u!m'}  Gleanings  from  the  German  Journals.  131 
be  mistaken  for  eucalyptol,  the  important  constituent  of  oil  of  euca- 
lyptus.— Pliarm.  Ztg.,  1890,  21. 
An  iodine  ointment  can  be  made  by  agitating  powdered  iodine 
with  melted  yellow  vaseline  ;  about  3  per  cent,  iodine  will  be  dis- 
solved and  retained  in  solution  upon  cooling. — D.  Med.  Ztg.\ 
Pliarm.  Ztg.,  1890,  22. 
Hydrastis  canadensis. — The  ash  of  this  drug  has  been  found  to 
contain  aluminium  oxide  in  quantity  equal  to  0-3  per  cent,  of  the 
dry  drug ;  the  total  ash  amounts  to  4-80  per  cent. — Dr.  R.  Gaze, 
Apoth.  Ztg.,  1890,  9. 
Reduced  iron  may  be  volumetrically  examined  by  the  following 
method  :  One  gram  is  placed  in  a  200  cc.  cylinder  or  flask,  dis- 
solved in  40-50  cc.  dilute  sulphuric  acid  (1:5)  and  potassium  per- 
manganate solution  added  carefully  until  a  permanent  red  color  is 
produced;  by  the  addition  of  a  dilute  sugar  solution  the  excess  of 
permanganate  is  decomposed  and  the  solution  diluted  with  water 
to  200  cc.  Of  this  solution  50  cc.  (=  0-25  gm.  of  reduced  iron)  are 
placed  in  a  flask,  a  solution  of  two  grains  of  potassium  iodide  in 
water  and  a  few  cc.  of  hydrochloric  acid  added  and  the  flask  corked  ; 
after  standing  for  one  hour  the  liberated  iodine  is  titrated  with 
solution  of  sodium  thiosulphate  adding  a  little  starch  solution 
towards  the  end  of  the  titration.  The  number  of  cc.  thiosulphate 
required,  multiplied  by  0-0056  will  give  the  amount  of  total  iron 
(metallic  iron  and  magnetic  oxide  of  iron).  The  percentage  of 
metallic  iron  may  be  obtained  directly  by  multiplying  the  cc.  of 
thiosulphate  solution  used  by  8-12  and  subtracting  262-5. — Dr.  A. 
Partheil,  Apoth.  Ztg,  1890,  55. 
Lard  adulteration  with  cotton-seed  oil. — Prof.  Dr.  A.  von  Asboth 
in  Chemiker  Ztg.,  1890,  93,  confirms  the  results  of  Muter  and  De 
Koningh's  method  of  examining  the  above  adulteration.  This 
method  is  based  upon  the  isolation  of  the  fluid  fatty  acids  and  deter- 
mining the  iodine  absorption  of  these  acids.  Three  grams  of  the 
sample  are  saponified  with  alcoholic  KOH  and  the  neutralized  solu- 
tion (with  acetic  acid)  is  poured  into  a  boiling  mixture  of  30  cc.  10 
per  cent,  lead  acetate  solution  and  200  cc.  water,  stirring  constantly  ; 
the  lead  soap  is  thoroughly  washed  by  decantation,  and  afterwards 
treated  with  1 20  cc.  of  ether  After  standing  1 2  hours  the  mixture 
is  filtered,  the  precipitate  thoroughly  washed  with  about  120  cc. 
of  ether,  sufficient  dilute  HCl  (1  14)  added    to    make  250  cc. 
