GLEANINGS  FROM  GERMAN  JOURNALS.  819 
cent,  of  tannin.  Sound  and  light  colored  myrobalans  are  re- 
duced to  a  coarse  powder,  washed  Avith  cold  water,  dried  and 
treated  with  ether  in  the  usual  manner.  The  tannin  obtained 
is  closely  related  to  the  tannin  of  Aleppo  galls. — Pharm.  Centr, 
R.,  1869,  370. 
Pure  CMo7^oform,  made  by  E.  Sobering  from  chloral  hydrate, 
and  after  having  been  treated  with  pure  concentrated  sulphuric 
acid,  has  a  specific  'gravity  of  1-5022  at  15°  C  ,  and  boils  be- 
tween 62-3  and  62-5°  C.  Exposed  to  the  sunlight  for  several 
days  it  is  not  altered  in  the  least,  and  Hager  concludes  that  those 
who  observed  differently,  experimented  with  an  impure  chloro- 
form. The  best  and  only  rational  mode  for  preparing  chloro- 
form for  internal  use  is,  according  to  Scherer,  from  chloral  hy- 
drate.—iM,  1870,  128-139. 
Test  for  Chloral- Alcoholate.  Hager  uses  Lieben's  iodoform 
test  for  detecting  the  presence  of  alcohol  in  chloral  hydrate,  and 
operates  as  follows :  About  0*5  grm.  chloral  hydrate  are  dis- 
solved in  10  c.c.  distilled  water,  the  solution  is  made  lukewarm, 
and  sufficient  solution  of  iodine  in  iodide  of  potassium  is  added 
to  render  it  dark  brown ;  potassa  solution  is  now  carefully 
dropped  in  until  the  liquid  is  just  rendered  colorless.  Every 
drop  of  the  potassa  solution  produces  a  turbidity  which  disap- 
pears on  agitation  if  the  chloral  hydrate  is  pure,  but  is  perma- 
nent in  case  of  alcohol  being  present,  from  the  formation  of  iodo- 
form, a  portion  of  which  is  dissolved  by  the  chloral. — Ihid.  155. 
Soluhility  of  Sulphates  in  Sulphuric  Acid.  If  sulphuric  acid 
containing  lime,  baryta,  strontia  or  lead,  is  evaporated  in  a  pla- 
tinum dish,  the  sulphates  of  these  bases  are  obtained  in  the  form 
of  small  shining  crystals,  which  are  not  altered  by  raising  the 
heat  above  338°  C,  the  boiling  point  of  sulphuric  acid.  H. 
Struve  found  that  100  parts  of  acid  will  dissolve 
Concentrated  Sulphuric  Acid.    Nordhausen  Acid. 
Sulphate  of  lime,  2-03  10-17 
"         baryta,  5-69  15-89 
"         strontia,  5*68  9-77 
lead,  0-13  4-19 
^Zeitsclir.f  Anal  Chemie.,  1870,  34-38. 
