BOGOTA  BARKS  FROM  NEW  GRENADA. 
311 
the  very  touch-stone  really  specified  by  law  by  which  it  should 
be  judged.  The  U.  S.  Pharmacopoeia  directs  oxychloride  of 
antimony  in  the  preparation  of  tartar  emetic ;  as  well  might  the 
Examiner  reject  foreign  tartar  emetic  because  it  is  made  of  the 
subsulphate  or  oxysulphuret. 
At  the  request  of  Mr.  C.  H.  Dingee,  who  sent  me  the  fore- 
going copy  of  the  Deputy  Collector's  letter,  with  a  bottle  of  the 
rejected  sulphate  of  quinine,  an  examination  was  made  with  the 
following  results  : 
"  1st.  Ten  grains  of  the  suspected  sulphate  was  not  wholly 
dissolved  at  the  temperature  of  212°  (Fahr.)  by  250  grains  of 
water,  but  formed  a  transparent  solution  with  less  than  320 
grains.  After  the  solution  had  stood  24  hours,  the  salt,  which  sepa- 
rated in  crystals,  when  carefully  collected  and  air  dried,  weighed 
9.1  grains.  The  liquid  from  which  the  salt  separated  when 
evaporated  to  dryness,  yielded  .81  gr.  of  crystals,  which  re-acted 
with  tests  like  the  original  salt. 
«  2d.  Ten  grains  of  the  suspected  sulphate  was  put  into  a  test 
tube  with  23  drops  of  water,  two  drops  of  sulphuric  acid,  and 
shaken  until  dissolved,  after  which  90  drops  of  ether  and  30 
drops  of  spirit  of  ammonia  were  added  and  shaken  together.  In 
a  few  moments  the  mixture  separated  into  two  transparent  liquids 
without  any  solid  or  undissolved  matter  intervening ;  nor  had 
any  crystallization  or  other  change  occurred  in  the  ethereal  solu- 
tion at  the  end  of  36  hours. 
"  3d.  Ten  grains  of  the  suspected  sulphate  dissolved  in  water 
by  means  of  two  drops  of  sulphuric  acid,  yielded  a  bulky  white, 
uncrystalline  precipitate  on  adding  a  slight  excess  of  ammonia  ; 
by  heating  the  tube  the  precipitate  coalesced  into  a  mass  which, 
after  being  washed  and  dried,  weighed  7-4  grains.  A  part  of 
this  dissolved  in  absolute  alcohol,  remained  as  a  resin-like  resi- 
due on  evaporation  without  the  formation  of  crystals. 
"4th.  (Kent's  test.)  Five  grains  of  the  suspected  salt  was 
dissolved  in  half  a  drachm  of  acetic  acid,  four  drops  of  tincture 
of  iodine  added,  and  heat  applied  until  the  liquid  became  reddish 
brown  and  transparent.  On  cooling,  the  solution  deposited  nu- 
merous green,  cantharides-lustred  crystals  of  the  iodo-sulphate 
of  quinia  of  Dr.  Herapath.  (See  page  317.) 
«  Finally,  the  suspected  sulphate  of  quinine  reacts  with  chlo- 
rine water  and  ammonia,  and  with  chlorine  water,  prussiate  of 
