420 
GLEANINGS  FROM  GERMAN  JOURNALS. 
frequently  adulterated  with  it,  Dr.  Schlosser  recommends  the 
following  process  :  3  grammes  of  the  gum  are  dissolved  in  15 
grms.  cold  distilled  water,  to  the  solution  30  grms.  of  Goulard's 
extract,  1^.  Austr.  1853,*  are  added,  and  filtered  through  a 
small  filte**.^  Pure  gum  arable  yields  in  about  an  hour  a  scarcely 
opalescent  filtrate  weighing  18  to  20  grm.,  and  the  residue  is 
not  fluid.  Senaar  gum  yields  very  slowly  (in  twenty-four  hours) 
a  milky  filtrate,  and  the  residue  upon  the  filter,  after  20  grm. 
have  passed,  is  still  liquid  ;  a  second  filtration  renders  the  fil- 
trate clear. 
6  grm.  of  the  filtrate  are  diluted  with  5  grm.  water,  and  then 
mixed  with  IJ  grm.  ammonia,  sp.  gr.  '960.  With  pure  gum 
arabic  an  almost  clear  liquid  is  obtained,  which  in  twenty-four 
hours  deposits  a  slight  precipitate ;  senaar  gum,  however,  pro- 
duces a  stiff  white  gelatinous  mass,  and  gum  arabic  adulterated 
with  dextrin  behaves  in  this  respect  similar  to  senaar  gum  ;  this 
appears  to  come  from  a  different  source.  Gum  Senegal  behaves 
exactly  like  gum  arabic. — Zeitschr.  d.  Oester.  Apoth,  Ver.  1869, 
209,  210. 
The  soluble  saccharated  Oxide  of  Iron  as  an  antidote  to  Ar- 
se7iic  has  been  experimented  with  upon  animals  by  Dr.  H.  Koeh- 
ler,  of  Halle.  He  regards  it  as  a  useful  antidote,  and  recom- 
mends not  to  use  albumen  nor  saline  purgatives  with  the  iron, 
but  afterwards  remove  the  neutralized  arsenic  by  emetics. — iV. 
Jahrh.f,  Pharm.  1869,  Marz,  129—150. 
Preparation  of  pure  muriatic  acid, — P.  W.  Hofmann,  (Ber,  d. 
Chem.  Gesellsch.  zu  Berlin,  i,  No.  21,)  found  that  when  to  crude 
muriatic  acid,  contained  in  a  suitable  vessel,  sulphuric  acid  sp. 
gr.  1'84:8  is  added,  muriatic  acid  gas  is  at  once  evolved,  which 
may  be  washed  and  absorbed  by  distilled  water.  The  evolution 
of  gas  is  very  regular,  accompanied  by  little  heat,  and  ceases 
only  when  the  sulphuric  acid  is  reduced  to  sp.  gr.  1*566.  It 
contains  then  only  0-32  per  cent.  HCl,  and  no  further  loss  is 
sustained  besides  the  dilution  of  the  sulphuric  acid. — Buchners 
N.  Repert.  117, 118,  from  Ber.  d.  chem.  G-es.  zu  Berlin  I,  No.  21. 
■^This  being  made  of  2  sugar  of  lead,  1  Utharge,  and  8  water,  is  about 
half  the  strength  of  that  officinal  in  TJ.  S.  P. 
