Am.  Jour.  Pharm. 
August,  1920, 
U.  S.  Pkarmacopoeial  Revision. 
557 
agents  be  avoided.  Waters  made  in  this  way  may  be  truly  sterile  and 
will  keep  much  better  than  when  made  by  the  present  general  formula. 
Ceratum  Cantkaridis. — If  practicable  a  physiological  test  for  the 
activity  of  cantharides  cerate  should  be  introduced. 
Ceratum  Resinae. — ^There  should  be  a  slight  change  in  the  direc- 
tions so  that  the  rosin  will  not  separate  during  cooling.  It  would 
be  better  to  direct  that  when  the  melted  mixture  is  strained,  it  be 
stirred  continuously  until  it  starts  to  congeal. 
Elixir  Aromaticum. — ^The  use  of  purified  siliceous  earth  is  pre- 
ferable to  purified  talc,  as  it  filters  more  rapidly  and  produces  a 
brilliantly  clear  elixir. 
Extractum  Cannabis. — Glucose  is  not  a  satisfactory  diluent  be- 
cause of  the  resinous  character  of  this  extract.  It  is  suggested  that 
rosin  or  some  other  more  suitable  substance  be  experimented  with 
as  a  diluent. 
Glyceritum  Acidi  Tannici. — ^The  direction  to  strain  the  solution 
through  cotton,  while  warm,  is  impracticable.  The  agitation  of  the 
mixture  in  a  wide-mouthed  bottle,  is  also  difficult.  It  would  be 
better  to  stir  it  with  a  heavy  glass  rod  or  wooden  paddle. 
Infusum  Digitalis. — Reintroduce  the  lo  per  cent,  of  alcohol, 
heretofore  directed  for  infusion  of  digitalis.  The  infusion  as  now 
prepared  often  ferments  before  the  patient  can  use  all  of  it,  and  the 
small  percentage  of  alcohol  is  not  objectionable. 
Linimentum  Ammoniae.—V^sxmt  oil  can  very  satisfactorily 
replace  oil  of  sesame.  The  latter  oil  is  difficult  to  obtain  and  ex- 
pensive, as  it  is  imported,  and  peanut  oil  produces  a  superior  emul- 
sion and  is  an  American  product. 
Linimentum  C amphorae. — Peanut  oil  can  also  be  used  in  this 
liniment  to  advantage,  replacing  the  cottonseed  oil  which  is  a  semi- 
drying  oil  and  unsatisfactory  for  external  application.  It  would 
be  desirable  to  introduce  here  a  more  practicable  assay.  The  evap- 
oration method  is  sufficiently  accurate  and  may  be  easily  applied 
without  special  apparatus. 
Liquor  Cresolis  Compositus. — ^The  formula  submitted  by  Mr. 
Samuel  L.  Hilton  (/.  A.  Ph.  A.,  p.  759,  1919),  directing  the  use  of 
sodium  hydroxide  and  oleic  acid  for  the  extemporaneous  preparation 
of  soap  in  this  solution,  is  approved.    The  formula  is  as  follows : 
Cresol   ..    500  Gms. 
Oleic  Acid  
Sodium  Hydroxide  
Water,  sufficient  to  make 
226  Gms. 
35  Gms. 
000  Gms. 
