78  Gleanings  from  the  German  Journals.  {Am,Feb.a£9.arm* 
Solubility  of  corrosive  sublimate  in  solutions  of  sodium  chloride. 
Dr.  Homeyer  and  E.  Bitsert  report  the  following : 
Percentage  of  100  parts  Na  CI  solution  dissolve 
Na  CI  solution,  at  15°  at  65°  at  100° 
26  per  cent,  (saturated).  128  gm.  Hg  Cl2  152  gm.  HgCl2  208  gm.  HgCl2 
25 
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For  hospital  use,  instead  of  a  concentrated  alcoholic  solution,  they 
recommend :  Corrosive  sublimate  50 ;  sodium  chloride  5 ;  distilled 
water  45.— Pharm.  Ztg.,  1888,  739. 
Sodium  hydrate  containing  nitrate  is  a  common  article  of  commerce, 
the  origin  of  the  nitrate  being  the  demand  for  a  pure  white  sodium 
hydrate,  to  obtain  which  from  2  °f0  to  3  %  nitrate  are  added  by  the 
manufacturer.  This  impurity  is  especially  objectionable  in  nitrogen 
determinations  using  KjeldahPs  method  by  making  the  results  too 
high. — Dr.  Schweissinger,  Pharm.  Centralhalle,  1888,  587. 
Syrupus  Ferri  Iodidi  has  been  studied  by  Zelinka  relative  to  its  de- 
composition ;  the  conclusions  arrived  at  are  that  if  a  pure  distilled 
water,  free  from  chlorine,  ammonia,  carbon  dioxide  and  other  volatile 
impurities,  obtained  by  rejecting  the  distillate  until  this  gives  no  re- 
action with  silver  nitrate,  be  used  in  the  preparation  of  the  syrup  a 
product  will  result  that  can  be  kept  in  larger  quantites  for  a  long 
time.— Pharm.  Post,  1888,  794. 
Volumetric  estimation  of  glucose. — In  the  usual  method  by  precip- 
itation with  Fehling's  solution,  the  cuprous  oxide  renders  the  end  re- 
action indistinct  to  prevent  which  H.  Causse  recommends  the  addition 
of  ferro-cyanide  of  potassium  to  the  reagent  which  will  dissolve  the 
precipitated  cuprous  oxide  and  which  itself  exerts  no  reducing  action 
on  Fehling's  solution.  To  carry  out  the  operation  10  cc.  Fehling's 
solution  are  mixed  with  4  cc.  solution  of  ferrocyanide  of  potassium 
(1:2),  heated  to  the  boiling  point  and  the  sugar  solution  added,  drop 
by  drop,  until  the  solution  becomes  colorless. — (Bull.  Soe.  Chim.) 
Chem.  Ept.,  1888,  338. 
Volatile  Alkaloid  in  Ipecacuanha. — E.  M.  Arndt  in  distilling  a 
mixture  of  powdered  ipecac,  potassium  carbonate,  ferric  chloride  and 
water,  noticed  in  the  condenser  white  crystals  while  the  distillate  had 
an  alkaline  reaction  and  was  fluorescent ;  the  alkaloid  was  obtained 
