460  Gleanings  from  the  German  Journals.  {AmsSt.?if9iarm' 
samples  were  dissolved  in  1 5  cc.  absolute  alcohol  and  an  excess  of 
Hiibl's  iodine  solution  added  (to  permanent  red  color)  and  allowed 
to  stand  for  various  periods  of  time  (this  to  determine  when  the 
absorption  was  complete,  it  will  be  seen  that  there  was  no  variation 
after  12  hours)  and  the  excess  of  iodine  titrated  with  standardized 
sodium  thiosulphate  ;  the  absorbed  iodine  is  calculated  to  100  parts 
oil  : 
A fter  Sta  ndi  ng 
Variety.            2  Hours.  4  Hours.  8  Hours.  12  Hours.  24  Hours. 
English,  ....  42-1  48-4  52-8  52-9  No  change. 
German,    .  .  .63-5  66'2  67-3  697  69*9 
American,  .  .  .  64-4  66"6  69*8  72*3  No  change. 
Russian,.  .  .  .84-5  92-4  96-5  96-8  "  " 
To  determine  the  effect  of  smaller  quantities  of  turpentine  oil  as 
an  adulteration  on  this  test,  some  of  the  English  and  Russian  oils 
used  above  were  mixed  with  varying  amounts  of  French  oil  of  tur- 
pentine. The  following  figures  were  obtained  after  allowing  to  stand 
for  8  hours  with  the  Hubl's  reagent : 
Percentage  of 
Oil  of  Turpentine.  English  Oil.  Russian  Oil- 
5  132-0  246-8 
IO  158-3  258-3 
15  212-8  318-4 
See  Am.  Journ.  Pharm.,  1890,  570. — Pharm.  Ztschr.  f  Russl, 
1891,  417. 
V  Preparation  of  ammonium  sulphide. — Instead  of  the  usual  method 
of  saturating  solution  of  ammonia  with  hydrogen  sulphide, 
Donath  recommends,  when  only  small  quantities  of  this  reagent  are 
required,  to  place  one  part  powdered  ammonium  chloride  in  a  retort 
connected  with  a  good  condenser,  to  add  a  solution  of  two  parts 
crystallized  sodium  sulphide  in  five  parts  boiling  water  and  distil  off 
about  one-half  of  the  liquid  in  the  retort ;  the  distillate  represents 
a  very  concentrated  and  trustworthy  reagent. —  Chemiker  Ztg.,  1891, 
1021. 
Detection  of  arsenic  in  metallic  iron. — The  German  Pharmacopoeia 
contains  the  following  test :  1  gm.  powdered  or  reduced  iron  with 
15  cc.  hydrochloric  acid  and  15  cc.  water  in  a  Marsh's  apparatus 
should  evolve  a  gas  which  ignited  must  not  deposit  stains  upon  a 
porcelain  capsule  used  in  depressing  the  flame.  In  comparing  this 
test  with  Bettendorf  s  (which  is  employed  in  the  examination  of  most 
