322 
GLEANINGS  FROM  GERMAN  JOURNALS. 
permanganate  is  gradually  added  until  the  liquid  above  the 
rapidly  subsiding  precipitate  of  peroxide  of  manganium  remains 
of  a  reddish  color  ;  the  excess  of  the  permanganate  is  now  titrated 
with  hyposulphite  of  soda. — Zeitschr.  f.  Anal.  Chem.^  1870, 
39-41. 
Permanganate  of  Potassa  in  Alkaline  Solution. — Dr.  Mohr 
proves  that  if  this  solution  is  absolutely  free  from  organic  matter 
it  may  be  heated  to  boiling  without  turning  green,  {i.  e.,  becom- 
ing reduced  to  manganate).  For  making  such  solutions  fused 
alkalies  only  ought  to  be  employed,  and  the  use  of  filtering 
paper,  strainers  and  all  organic  materials  ought  to  be  carefully 
avoided.— iJzt^.  43-45. 
P.  TF.  Hofmanns  Method  of  Preparing  Pure  Hydrochloric 
Acid  (see  Amer.  Jour.  Pharm.,  1869,  420),  according  to  Fre- 
senius,  yields  in  all  stages  of  the  process  an  acid  containing 
much  arsenic,  if  this  metal  was  present  in  one  of  the  crude  acids, 
and  also  free  chlorine,  if  the  sulphuric  acid  contained  oxides  of 
nitrogen. — Zeitschr.  f.  Anal.  Chem.,  1870,  64-66. 
hifluence  of  Ainmonia  on  Guaiacum  Paper.  A  Greiner  found 
thiit  guaiac  paper,  moistened  with  a  very  dilute  solution  of  sul- 
phate of  copper  and  exposed  to  the  vapors  of  ammonia  or  car- 
bonate of  ammonia,  assumes  a  blue  or  blue  green  color,  and  re- 
gards it  as  hazardous  to  attempt  to  distinguish  these  gases  from 
hydrocyanic  acid  merely  from  the  different  tints  produced  with 
this  test  paper  (HCy  colors  it  indigo  blue). — Ihid.  94,  95. 
Sanguinarina.  H.  Naschold  has  prepared  this  alkaloid  and 
a  number  of  its  compounds  and  studied  their  properties  ;  his 
formula  for  the  alkaloid  is  Cg^HigNOg. — Zeitschr.  f.  Ohem.,  1870, 
119-121,  from  Journ.  prakt.  Chem. 
Among  the  prize  queries  of  the  Academy  of  Medicine  in  Mad- 
rid for  the  year  1871,  is  one  to  demonstrate,  by  practical  experi- 
ments, which  variety  of  poppy  is  best  adapted  to  culture  in 
Spain,  the  yield  of  opium  and  the  percentage  of  morphia  con- 
tained therein. — Pharm.  Zeitung,  1870,  No.  22. 
The  philosophical  faculty  of  the  University  of  Goettingen 
has  published  the  following  prize  query  of  the  Beneke  fund  for 
the  year  1870  :    The  exact  determination  of  the  atomic  weight  of 
