62       ON  Campbell's  process  for  fluid  extracts. 
more  at  a  time,  the  increased  bulk  of  opium  can  be  more  con- 
veniently adjusted  in  the  percolator  than  when  such  small  quan- 
tities are  worked. 
The  writer  would  state  in  this  connection  that,  in  his  article 
on  tincture  opium,  which  appeared  in  the  last  number  of  this 
Journal,  he  omitted,  in  the  first  line  of  the  directions  to  that  pro- 
cesSj  the  following  words  :  "  in  the  hot  water which  should  have 
followed  ^'powdered  opium.'' 
Philadelphia^  October^  1869. 
NOTE  ON  CAMPBELL'S  PROCESS  FOR  FLUID  EXTRACTS. 
B?  George  W.  Kennedy. 
To  THE  Editor  : 
Dear  sir,  allow  me  to  make  a  few  remarks  on  Campbell's  pro- 
cess for  fluid  extracts.  Being  in  a  large  house  in  this  city  in 
charge  of  the  prescription  department,  and  using  hundreds  of 
pounds  of  fluid  extracts,  at  wholesale  and  retail,  annually,  until 
lately,  all  our  stock  of  them  was  received  from  Northern  houses. 
Not  being  satisfied  with  their  quality,  I  suggested  to  the  firm  to 
make  the  fluid  <3xtracts,  in  connection  with  the  other  business, 
which  was  agreed  to.  Among  the  objectionable  fluid  extracts 
was  one  of  buchu,  which  could  hardly  be  recognized  by  its  odor, 
and  when  examined  was  found  to  yield  but  one-fourth  of  one 
per  cent,  of  volatile  oil,  whilst  the  drug  contains  from  three- 
fourths  of  one  per  cent  to  one  and  a  half  per  cent.,  according  to 
the  variety. 
I  think  the  time  has  come  when  every  druggist  should  prepare 
the  fluid  and  solid  extracts  he  sells,  to  protect  himself  from 
worthless  or  inferior  preparations,  which  are  to  be  found  in  com- 
merce. The  excuse  is  that  too  much  time  and  trouble  are 
required,  but  they  would  gain  reputation  and  business  two-fold 
by  doing  so. 
I  first  made  20  lbs.  of  fluid  extract  of  buchu  according  to  Mr. 
Campbell's  process,  and  found  it  to  be  a  very  fine  extract.  The 
dregs  left  when  percolated  with  alcohol  of  -835  sp.  gr.  did  not 
show  the  presence  of  volatile  oil  or  resin  when  water  was  added, 
and  had  no  odor  of  buchu  whatever. 
