g6  Gleanings  from  the  German  Journals.  {ArnFeb.?i89iarm' 
cerate  is  allowed  to  cool  somewhat  and  05  each  of  the  oils  of  lemon 
and  bergamot  incorporated  and  poured  into  proper  moulds.-^- 
Scheerer,  0 ester.  Ztschr.  f  Pharm.,  1890,  631. 
Pine-spirit  or  Pine-vapor,  used  as  a  spray  in  purifying  the  atmos- 
phere of  rooms,  is  made  as  follows  :  70-0  oil  of  pinus  sylvestris,  8-0 
oil  of  juniper  berries,  5-0  oil  of  rosemary,  2-0  each  of  the  oils  of 
lavender  and  lemon,  ro  oil  of  bergamot  and  iooo-o  alcohol  are 
allowed  to  stand  in  a  moderately  warm  place  for  several  days,  fil- 
tered and  then  bottled.  A  more  pleasant  aroma  is  obtainable  if 
to  the  above  be  added  200-0  pine  twigs  and  500*0  additional 
alcohol  and  distilling  after  allowing  to  stand  for  a  few  days. — 
Scheerer,  0 ester.  Ztschr.  f.  Pharm.,  1890,  632. 
Arsenic  in  commercial  acids. — G.  Buchner  calls  attention  to  the 
fact  that  commercial  hydrochloric  and  sulphuric  acids  at  present  con- 
tain large  quantities  of  arsenic.  An  examination  of  a  sample  of 
sulphuric  acid  disclosed  the  presence  of  131  grams  As203  in  100 
kilograms  of  the  acid ;  in  a  sample  of  hydrochloric  acid  592  grams 
As2Oa  were  found  for  100  kilograms.  50  grams  of  the  sulphuric 
acid  and  10  grams  of  the  hydrochloric  acid  contain  a  lethal  dose  of 
arsenious  oxide. —  Chcmiker  Ztg.,  1891,  13. 
Ferricyanide  of  potassium. — Dr.  G.  Kassner  publishes  a  new 
method  for  the  preparation  of  this  valuable  chemical  which  allows 
of  a  cheaper  production,  and  therefore  more  extended  use.  By 
heating  calcium  plumbate  and  potassium  ferrocyanicle  together  and 
passing  C02  over  the  heated  mass  the  following  reaction  takes 
place  :  Ca2Pb04  +  2K4Fe(CN)6  +  4C02  =  K6Fe2(CN)12  +  K2COs  + 
2CaC03  -}-  PbC03.  Treating  the  mass  with  water  dissolves  the 
ferricyanide  and  carbonate  of  potassium,  the  former  crystallizing 
after  concentrating  the  solution,  the  latter  remaining  in  the  mother- 
liquor  ;  the  insoluble  portion  consists  of  the  carbonates  of  lead  and 
calcium,  which  can  be  used  in  regenerating  the  calcium  plumbate. — 
{O  ester.  Chem.  u.  Techn.  Ztg.)  Chem.-techn.  Central- Anz.,  1890,  511. 
Alkaloidal  assay  of  narcotic  extracts. — 2  gm.  extract  are  dissolved 
in  8  cc.  water,  2  cc.  water  of  ammonia  added,  thoroughly  agitated 
with  40  cc.  of  a  mixture  composed  of  15  cc.  chloroform  and  25  cc. 
ether,  and  set  aside.  (This  mixture  of  chloroform  and  ether  is  lighter 
than  the  extract  solution ;  by  taking  20  cc.  chloroform  arid  20  cc. 
ether  a  solvent  is  obtained  which  is  heavier  than  the  extract  solution; 
these  mixtures  are  recommended  because  no  emulsions  are  formed  by 
