AmNov!';i892arm'}  Gleanings  from  the  German  Journals.  565 
between  the  two.  Bari-oil  with  the  test  gives  a  red  coloration  equal 
in  intensity  to  olive  oil  containing  10  per  cent,  sesame  oil,  but  this 
coloration  never  appears  immediately  after  the  separation,  but 
always  requires  several  minutes  for  its  development ;  again,  the  color 
always  shows  a  bluish-violet  shade.  Of  interest  is  also  an  observa- 
tion made  with  an  old,  strongly  rancid  sesame  oil,  this  gave  an 
indigo  blue  instead  of  a  wine-red  coloration. — Dr.  G.  Amblihl. 
Schwz.  Wochenschr.  f.  Chem.  u.  Pharm.,  1892,  381. 
Syrup  of  Glycyrrhiza  made  from  the  root  must  vary  in  quality  as 
the  root  contains  more  or  less  of  glycyrrhizin.  Dr.  O.  Linde  pro- 
poses to  first  isolate  the  acid  ammonium  glycyrrhizin  and  use  this  in 
the  preparation  of  the  syrup.  The  cut  root  is  extracted  with  cold 
water,  the  liquid  boiled,  filtered,  concentrated,  precipitated  with  an 
excess  of  dilute  sulphuric  acid,  the  precipitate  washed,  dissolved  in 
the  least  possible  quantity  of  ammonia  water  and  the  solution  evap- 
orated upon  plates  at  a  moderate  temperature.  Prepared  by  this 
method  the  ammoniated  glycyrrhizin  will  conform  to  the  following 
tests:  (1)  Heated  with  solution  of  potassium  hydrate  it  evolves 
ammonia.  (2)  O-i  gm.  must  be  completely  soluble  in  10  gm.  cold 
water,  forming  a  clear,  pale-brown  solution  having  a  faint  acid 
reaction.  (3)  This  solution  with  3  gm.  dilute  acetic  acid  yields  a. 
precipitate,  coagulating  by  stirring,  and  an  almost  colorless  filtrate 
which  should  be  free  from  mineral  acids.  (4)  1  gm.  dissolved  in 
2  cc.  water  of  ammonia  and  4  cc.  alcohol  with  1 5  cc.  absolute  alcohol 
forms  a  very  turbid  mixture.  (5)  o- 1  gm.  must  dissolve  in  3  gm. 
glacial  acetic  acid  with  pale-brown  color,  the  addition  of  20  cc.  water 
causes  a  coagulable  precipitate,  whilst  the  filtrate  is  almost  colorless. 
If  the  above  extraction  be  made  with  a  dilute  ammonia  water  a 
better  yield,  although  of  inferior  quality,  can  be  obtained,  the 
ammonia  extracting  bitter  and  resinous  principles  which  afterwards 
are  removed  with  great  difficulty. 
To  make  the  syrup  4  parts  ammoniated  glycyrrhizin  are  dissolved 
in  a  mixture  of  4  parts  alcohol  and*  26  parts  water  and  added  to  166 
parts  simple  syrup. — Pharm.  Centralhalle,  1892,  531. 
Stability  of  Volumetric  Solutions. — Potassium  permanganate  solu- 
tion. A  solution  (1  :  1,000)  exposed  to  diffused  daylight  was  found 
to  have  suffered  no  decomposition  in  ihe  course  of  a  year;  at  the 
end  of  eighteen   months'  exposure  a  loss  of  2:6.1.  per  cent,  was 
