AmkJa°rch,S.rm"}  Gleanings  from  the  German  Journals.  133 
coloring  principle  passes  into  the  chloroform  layer  and  is  turned 
blue  by  ammonia.  Red  Saunders,  the  yellowish-red  color  is 
imparted  to  the  chloroform,  ammonia  entirely  decolorizing. — De 
Groot,  Oesterr.  Ztschr.f.  Pharm.,  1892,  824. 
Sodium  peroxide,  Na202,  contains  41-02  per  cent,  oxygen,  of 
which  one-half  is  available  as  a  bleaching  agent.  The  anhydrous 
oxide  is  produced  when  sodium  burns  in  dry  air  or  oxygen  ;  when 
the  monoxide  or  its  hydrate  is  strongly  heated  in  a  current  of  air ; 
also  by  the  ignition  of  sodium  nitrate.  It  is  not  decomposed  by 
strong  heat,  but  boiling  the  aqueous  solution  readily  effects  decompo- 
sition. The  hydrated  peroxide  results  by  adding  hydrogen  peroxide 
to  a  twenty  per  cent,  solution  of  sodium  hydrate  and  can  be  precip- 
itated by  the  addition  of  alcohol.  For  the  properties  of  the  com- 
pound see  Am.  Journ.  Pharm  ,  1893,  9. — Sudd.  Apotheker  Ztg.,  1892, 
411. 
The  determination  of  hardness  in  ivaters  by  means  of  standard 
soap  solutions  must  be  carried  out  at  a  temperature  of  150  C.  if  reli- 
able results  are  to  be  obtained;  higher  temperatures  notably  decrease 
the  persistency  of  the  lather  even  with  an  excess  of  soap  solution. — 
Buchner,  Chemiker  Ztg.,  1892,  19S4. 
S  alley  Lace  tic  acid,  C6H4(OC2H302)COOH,  an  acid  for  which 
superior  antiseptic  properties  are  claimed,  is  made  by  the  action  of 
disodium  salicylate  upon  sodium  monochloracetate  at  a  temperature 
of  1200  C;  by  the  decomposition  with  dilute  hydrochloric  acid  this 
new  acid  is  separated  and  freed  from  sodium  chloride  by  washing 
with  cold  water ;  after  drying,  cold  ether  will  remove  any  free 
salicylic  acid  and  the  salicyl-acetic  acid  is  purified  by  crystallizing 
from  boiling  water,  forming  lustrous  laminae.  It  melts  at  1880  C. 
and  is  very  difficultly  soluble  in  cold  water,  ether,  chloroform  and 
benzol,  easily  soluble  in  boiling  water  and  alcohol.  The  antipyrine 
salt  of  this  acid  (melting  point  145  0  C.)  made  by  the  combination  of 
one  molecule  of  each  is  claimed  to  have  certain  advantages  over 
salipyrine  because  of  its  stronger  antiseptic  action.  —  Pharm. 
Centralhalle,  1893,  41. 
Salicylic  acid  in  presence  of  phenols  cannot  be  colorimetrically 
estimated  in  aqueous  solutions ;  in  alcoholic  solution,  however,  only 
the  former  reacts  with  ferric  chloride.  Dr.  A.  Fagans  furnishes  the 
following  working  method:  The  liquid  to  be  examined  is  acidified 
and  extracted  with  ether;  the  ethereal  solutions  are  evaporated  and 
