300     ON  SOME  PREPARATIONS  OF  THE  U.  S.  PHARMACOPEIA. 
sition  and  turns  black.  It  is,  therefore,  necessary  to  use  twice 
as  much  of  the  new  preparation  in  making  Hoffman's  Anodyne. 
Aloe  Purificata. — This  formula  is  intended  to  meet  a  want 
sometimes  occurring  with  commercial  aloes.  Yet  the  Pharmaco- 
poeia evidently  does  not  lay  great  stress  upon  it,  as  the  resulting 
preparation  is  not  directed  in  any  of  the  preparations  of  aloes. 
Ammonice  Valerianae. — This  formula  is  that  suggested  by 
Benjamin  J.  Crew,  (Amer.  Journ.  Pharra.,  vol.  xxxii.,  109), 
and  is  the  best  one  yet  published.  The  commercial  valerianic 
acid  is  not  always  sufficiently  concentrated  for  use  in  this 
formula,  it  must  be  monohydric  to  succeed,  and  the  precautions 
directed  to  get  the  ammoniacal  gas  dry  should  not  be  neglected. 
The  heat  generated  by  the  combination  of  the  gas  with  the 
acid  is  sufficient  to  keep  the  salt  liquid  until  saturated,  when, 
on  cooling,  it  becomes  a  loose  crystalline  mass.  It  is  very 
desirable  that  the  acid  should  be  completely  saturated,  that  the 
salt  be  as  free  as  possible  from  valerianic  odor,  the  salt  pos- 
sessing much  less  of  this  odor  than  the  free  acid.  The  manip- 
ulation requisite  to  produce  this  salt  in  the  greatest  perfection 
of  purity,  is  only  acquired  by  practice  and  familiarity  with  the 
process. 
Antimonii  Oxidum  was  formerly  only  known  in  the  Phar- 
macopoeia in  the  process  for  tartar  emetic  as  oxychloride. 
Now,  pure  oxide  of  antimony  is  made  an  officinal  preparation 
for  use  in  tartar  emetic  or  other  purpose.  It  is  an  ingredient 
in  Tyson's  Antimonial  Powder. 
Antimonii  Oxy  sulphur  etum. — Under  this  name  the  Kermes 
of  the  Codex  is  now  an  officinal  of  our  Pharmacopoeia.  It  is, 
probably,  the  most  active  of  the  several  forms  of  kermes,  and 
may  be  made  readily,  in  small  quantity,  over  a  gas  lamp. 
Antimonium  Sulphuretum  is  the  new  name  for  the  precipi- 
tated sulphuret  of  previous  editions,  and  corresponds  with  the 
name  in  the  British  Pharmacopoeia. 
Aqua  Ammonice,  the  old  name  of  the  1st  edition  of  our 
Pharmacopoeia,  has  been  re-adopted  for  liquor  ammonise,  and  it  is 
placed  among  the  waters,  in  obedience  to  a  resolution  of  the 
