216         ON  THE  PRESERVATION  OF  FLUID  EXTRACTS. 
tion,  in  keeping  with  the  elegance  of  the  apparatus  and  the 
liberal  provisions  of  this  noble  Government  Institution. 
Somewhat  similar  in  its  plan  of  operations  to  the  Phamaceu- 
tical  manufactory  just  described,  is  the  Pharmaeie  Centrale  des 
Pharmaciens  in  the  Faubourg  St.  Germain,  Paris  ;  this  is  the 
property  of  a  Stock  Company,  and  is  under  the  superintendence 
of  M.  Dorvault,  a  pharmacien  of  eminence,  somewhat  known  in 
this  country  by  his  work  entitled,  _Z7  Officine ;  it  is  a  general 
manufactory  of  chemical  and  pharmaceutical  products,  which 
are  sold  to  the  trade  exclusively  by  wholesale.  Although  less 
prepossessing  in  its  situation  and  external  appearance,  this 
establishment  is  the  scene  of  a  much  greater  variety  of  pharma- 
ceutical operations  than  the  foregoing,  and  if  thoroughly  ex- 
plored, note  book  in  hand,  would  afford  a  still  larger  fund  of 
pharmaceutical  information ;  as  my  opportunities  for  observa- 
tion were  limited,  owing  in  part  to  the  absence  of  M.  Dorvault, 
in  attendance  upon  a  Pharmaceutical  Convention  at  Rouen,  and 
in  part  to  the  pressing  nature  of  the  business  of  the  establish- 
ment, which  seemed  completely  to  occupy  all  its  employees,  and 
above  all,  as  I  have  fully  reached  the  limits  I  had  allotted  to 
this  essay,  I  shall  close  without  attempting  the  meagre  notice 
which  my  opportunities  would  allow  of  this,  the  original  source 
of  a  large  share  of  those  preparations,  which,  marked  with  the 
names  of  the  numerous  eminent  French  Pharmaciens,  reach  our 
country,  and  add  to  the  variety  upon  our  shelves.  Taking  leave 
of  Paris,  I  would  also  take  leave  of  the  kind  reader,  with  whom 
it  has  been  my  desire  to  share  in  some  degree  the  pleasures  and 
advantages  of  my  transatlantic  wanderings. 
ON  THE  PRESERVATION  OF  FLUID  EXTRACTS. 
By  Henry  Thayer,  M.  D. 
An  article  in  the  last  number  of  the  Journal  of  Pharmacy  on 
the  above  named  subject,  having  taken  for  its  text  a  paper  that 
I  read  before  the  American  Pharmaceutical  Convention,  I  avail 
myself  of  a  few  moments  leisure  to  pay  it  some  attention,  as 
the  conclusions  arrived  at,  although  in  some  respects  similar  to 
my  own,  do  not  seem  to  be  warranted  by  the  course  of  reason- 
ing. 
