Am' ja0n.ri8P76.arm' }  Gleanings  from  the  Foreign  Journals.  65 
wise  quite  white.  If  mixtures  with  other  oils  are  thus  tested,  solidifi- 
cation will  take  place  much  slower,  and  the  elaidin  will  be  usually  soft, 
and  of  a  more  or  less  yellowish  or  brownish  color. — Chem.  Centralbl., 
1875,  No.  47,  from  Musterzeitung. 
Removal  of  Silver  Stains  from  Clothes. — The  following  method  is 
particularly  successful  with  clothes  that  had  been  previously  washed. 
The  soiled  piece  is  for  a  few  minutes  immersed  in  a  concentrated  solu- 
tion of  chloride  of  copper,  and  the  stain  is  then  rubbed  with  a  crystal 
of  sodium  hyposulphite,  previously  dipped  into  ammonia  which  has  been 
diluted  with  an  equal  bulk  of  water.  If  the  copper  chloride  has  been 
quite  neutral,  the  color  of  the  fabric  will  not  be  affected.  This  process 
may,  if  necessary,  be  repeated  several  times. — Ibid.,  No.  48,  from  Phot. 
Arch. 
Quercitrin  and  Quercetin. — Jul.  Loewe  has  experimented  with  quer- 
citrin  prepared  by  himself  from  quercitron  bark,  and  found  it  not  to  be 
a  glucoside,  as  usually  assumed.  He  found  the  formula  of  quercitrin 
dried  over  sulphuric  acid  to  be  C15H1609 ;  when  fused  at  1300  C. 
(2660  F.),  it  was  C15H14Os ;  the  yellow  lead  compound  had  the  formula 
C15H14OsPbO ;  the  orange-colored  lead  compound,  the  formula 
C15H12072PbO,  and  the  formula  of  quercetin  was  found  to  be  C15H12Or 
The  latter  is  therefore  quercitrin  from  which  the  elements  of  water  have 
been  removed,  and  robinin  and  rutinin  are  probably  quercitrin  combined 
with  water ;  the  analyses  of  the  last-named  compound,  by  various 
authors,  agree  well  with  the  formula  C15H18O10. — Zeitschr.  f.  Analyt. 
Chem.,  1875,  233-241. 
To  Detect  Free  Hydrochloric  Acid  in  the  Presence  of  a  Chloride. — J.  Lb- 
wenthal  boils  the  liquid  with  peroxide  of  lead,  which  becomes  lighter  in 
color,  chlorine  being  liberated,  and  the  reaction  completed  in  five 
minutes.  Peroxide  of  lead  does  not  act  upon  the  chlorides  having  the 
formula  MCI,  nor  upon  pure  aluminic  chloride ;  but  ferric  chloride  is 
strongly  acted  upon  and  stannic  chloride  is  completely  decomposed  by 
boiling  with  lead  peroxide. — Ibid.,  p.  306. 
Detection  of  Resin  in  Wax. — Recently  several  apothecaries  and  drug- 
gists of  Berlin  were  cheated  with  beeswax  which  had  been  adulterated 
with  20  per  cent,  of  resin.  The  specific  gravity  of  pure  wax  being 
between  -960  and  '963,  it  will  float  in  officinal  ammonia  water  (spec, 
gr.  -960,)  while  a  sample  adulterated  with  resin  will  sink  in  the  same 
