110 
Aqua  pinna  momi,  U,  S.  P. 
<  Am.  JouR.PfMRMo. 
t    Mar'  L,  l&U. 
glucose;  hence  it  can  be  easily  seen  how  important  the  administra- 
tion of  this  in  connection  with  arrowroot  is  in  cases  of  marasmus  and 
other  infantile  diseases  arising  from  defective  nutrition. 
In  this  I  intended  to  present  a  formula  for  pancreatic  emulsion  of* 
cod-liver  oil  which  would  not  separate  upon  standing,  but  remain  per- 
fectly emulsified.  Want  of  time  has  prevented  this,  my  experiments, 
in  this  not  having  thus  far  proved  perfectly  satisfactory. 
Throughout  all  my  experiments  I  have  been  greatly  assisted  by 
both  my  partners,  to  whom  I  acknowledge  my  indebtedness,  and  to- 
much  information  and  pleasure  derived  through  a  careful  perusal  of" 
the  most  prominent  medical  periodicals  for  several  years  back.  1 
would  refer  the  reader  for  much  useful  information  to  the  back  num- 
bers of  the  Lancet,  Practitioner,  Medical  Press  and  Circular,  British 
Medical  Journal,  Che?nical  News,  Chemist  and  Druggist,  and  manp 
American  reprints. 
Philadelphia,  2  mo.,  1874. 
AQUA  CINNAMOMI,  U.  S.  P. 
By  Edmund  Backhaus. 
The  Pharmacopoeia  directs  for  preparing  this  water  to  take  of 
Oil  of  Cinnamon,  .  .    half  a  fluid  drachm,. 
Carbonate  of  Magnesium,      .  sixty  grains, 
Distilled  Water,   .  .  .    two  pints. 
Rub  the  oil  first  with  the  carbonate  of  magnesium,  and  then  witk 
the  water,  gradually  added,  and  filter  through  paper. 
Made  according  to  this  process,  no  doubt  many  pharmacists,  as  my- 
self, have  derived  unsatisfactory  results. 
At  first  the  filtered  water  is  of  a  beautiful  light  canary  yellow 
color,  but  on  standing  for  a  short  period  it  invariably  deposits  the- 
cinnamic  acid  contained  therein,  which  makes  it  a  very  unsightly 
preparation. 
In  order  to  procure  a  more  satisfactory  result  I  wTas  induced  to- 
make  several  experiments.  My  first  was  to  rub  up  the  oil  with  cal- 
cined magnesia,  thinking,  perhaps,  that  the  carbonic  acid  of  the  mag- 
nesia had  some  effect  on  the  oil ;  this,  however,  was  found  not  to  be- 
the  case. 
My  next  was  to  make  the  water  in  the  usual  way>  then  to  pass  car- 
