416  GLEANINGS  FROM  GERMAN  JOURNALS. 
lard's  extract,  a  small  precipitate,  which,  treated  like  the  former 
precipitate,  yields  more  of  the  same  crystals. 
The  filtrate  from  the  last  precipitate  by  subacetate  of  lead 
gives,  with  ammonia,  a  bulky  precipitate,  which,  freed  from  lead 
and  the  water  evaporated  over  sulphuric  acid,  yields  crystals  of 
the  lime  compound  of  phloretin.  The  mother  liquor  contains  a 
modification  of  the  tannin  of  the  bark,  which  is  identical  with 
the  tannin  of  iEs cuius  Hippocastanum,  and  undoubtedly  the 
material  yielding  the  phloretin,  which  differs  by  a  plus  of  C4H4 
from  the  composition  of  the  tannin ;  both,  on  splitting,  give 
phloroglucin.  A  substance,  having  the  composition  of  salicylic 
acid,  yields  an  acid  homologous  with  the  former. 
The  bark  of  the  trunk  contains  a  compound  dyeing  yellow. 
Ibid,  71—74. 
Creasote.  Prof.  v.  Gorup-Besanez  writes:  It  will  interest 
you  to  hear  that  the  beechwood  tar  creasote,  obtainable  at  pre- 
sent from  Mayence,  differs  from  the  Bohemian,  but  is  likewise 
not  identical  with  phenylic  acid.  It  agrees  in  boiling  point, 
specific  gravity  and  composition  with  Volckel's  creasote.  I  am 
at  present  investigating  the  products  of  substitution  by  chlorine, 
which  likewise  are  not  chloranile. — Ibid,  110. 
Preparation  of  pure  Corrosive  Sublimate.  Prof.  D.  H.  Fleck, 
of  Dresden,  evaporates  ten  pounds  mercury  with  1}  its  weight 
(12*5  lb.)  concentrated  sulphuric  acid,  evaporates  carefully  until 
a  grayish-white  saline  mass  remains  behind,  containing  neutral 
and  acid  mercuric,  and  some  mercurous  sulphate.  Nine  pounds 
pure  table  salt  is  added,  and  the  mixture  sublimed.  Sublimation 
begins  a  little  above  200°  C,  continues  very  uniformly,  and 
yields,  besides  muriatic  acid,  a  dense  white  sublimate  entirely 
free  from  adhering  acid.  A  salt  containing  7*43  parts  mercurous 
oxide  was  entirely  free  from  calomel. — Ibid,  116,  117,  from 
Journal  f.  prakt.  Chem.,  1866,  Heft  19  and  20. 
Delicate  test  for  Lime.  Sonstadt  recommends  tungstate  of  soda 
as  the  test  for  lime,  which  is  as  delicate  as  chlorides  for  silver,  or 
sulphates  for  baryta.  An  excess  is  to  be  avoided,  since  tungs- 
tate of  lime  is  slightly  soluble  in  tungstate  of  soda. — Ibid,  188, 
from  Jahresber.  d.  phys.  Ver.  zu  Frankfurt. 
