AmseJP°tu,r i87h9!rm* }  Gleanings  from  the  German  Journals.  455 
are  at  least  contained  in  100*000  grams  of  spring- water,  amount  to  543 
grams,  the  quantity  contained  in  the  natural  Karlsbad-water. — Pharm. 
Ztg.,  July  23,  1879. 
Liquor  Ferri  Persulphatis. —  Oltmanns  mixes  the  sulphuric  and 
nitric  acids  and  water,  and  gradually  adds  the  ferrous  sulphate  in  crys- 
tals, applying  a  moderate  heat  and  finally  boiling.  The  iron  dissolves 
quickly  and  is  immediately  oxidized  ;  the  reaction  is  moderate  and  any 
excess  of  nitric  acid  can  be  readily  removed  by  adding,  in  slight  excess, 
solution  of  ferrous  sulphate,  previously  mixed  with  a  proportionate  quan- 
tity of  sulphuric  acid,  and  again  by  adding  a  little  nitric  acid,  which 
escapes  quickly  on  boiling. 
Liquor  ferri  sesquichloridi  is  made  by  the  same  author  by  gradually  add- 
ing solution  of  ferrous  chloiide  to  the  mixture  of  the  acids;  the  latter 
is  not,  however,  used  by  the  author  before  it  has  a  brownish-red  color, 
which  is  readily  produced  by  moderately  heating.  The  mixture  must 
contain  sufficient  hydrochloric  acid  to  decompose  all  nitric  acid  ;  an 
excess  of  hydrochloric  acid  is  not  objectionable,  because  the  liquor  is 
finally  concentrated,  and  requires  the  addition  of  hydrochloric  acid  ; 
when  necessary,  either  ferrous  chloride  or  the  acid  mixture  may  be 
added. — Pharm.  Centralh.,  June  26,  1879,  p.  250. 
Unguentum  Potassii  Iodidi. — Schoch  modifies  the  formula  of  the 
German  Pharmacopoeia,  which  directs  1  part  sodium  hyposulphite 
to  20  parts  potassium  iodide,  by  adding  gradually  only  sufficient  hypo- 
sulphite to  remove  the  yellow  coloration.  The  addition  of  as  little 
as  j*q  per  cent,  iodine  will  then  become  apparent  by  the  color  of 
of  the  ointment,  the  iodine  remaining  in  a  free  state. — Pharm.  Ztg.^ 
July  12,  1879,  p.  425. 
The  color  of  infusum  ipecacuanhae  depends,  in  Th.  Paulack's 
opinion,  on  the  kind  of  water  used  in  preparing  it,  distilled  water  yield- 
ing a  m;.ich  lighter  colored  infusion  than  ordinary  water  containing  iron, 
nitric  or  nitrous  acid.  The  depth  of  the  color  increases  with  the  per- 
centage of  the  compounds  named. — Ibid. 
Indelible  Ink  not  Containing  Silver  Nitrate. — Hager  triturates 
10  parts  anilin  black  with  200  parts  alcohol  and  15  parts  fuming  hydro- 
chloric acid,  and  adds  a  solution  of  15  to  20  parts  gum  arabic  in  800  to 
1,000  parts  water.  After  standing  for  two  weeks  this  ink  can  be  used 
with  a  common  pen.    In  case  the  ink  is  to  be  used  for  marking  metal, 
