-"^"jimrisss™'}     Comparison  of  Galenical  Preparations.  ,  307 
Aoidum  hydroehloricum  dilutum  contains  of  HCl.  10  per  cent.,  U.  S.y 
12'5  per  cent.,  P.  G. 
Acidum  sulphuricum  dilutum. — Sulphuric  acid,  1  p. ;  water,  9  p. ; 
spec,  grav.,  1'067,  U.  S. — Sulphuric  acid,  1  p.  ;  water,  5  p. ;  spec,  gr., 
MIO  to  1-114,  P.  G. 
Alumen  exsiccatum,  U.  S.;  Alum  en  ustura,  P.  G. — Heat  alum,  184 
parts  to  80°C.  until  effloresced ;  then  heat  to  between  200°  and  205°C., 
until  100  parts  remain,  U.  S. — Heat  alum  100  p.  to  50°  C,  until 
about  30  p.  have  been  expelled,  then  increase  the  temperature  to  160° 
i\y  until  55  p.  remain.  P.  G.  The  result  is  practically  the  same  in 
both  cases. 
The  medicated  waters  which,  with  two  exceptions,  by  the  U.  S. 
Pharmacopoeia  are  made  by  dissolving  the  volatile  oils  in  distilled 
water,  are  by  the  German  Pharmacopoeia  prepared  by  distillation  of 
water  from  the  drug. 
Aqua  Amygdalce  amarce,  U.  S. — Aqua  Amygdalarum  amararum, 
P.  G. — Dissolve  oil  of  bitter  almonds  1  part  in  distilled  water  999 
parts,  U.  S. — Bitter  almonds  12  parts  are  pressed  cold,  then  powdered, 
and  macerated  for  12  hours  with  water  80  parts  and  alcohol  sp.  gr. 
*832,  one  part ;  then  distil  11  parts,  add  alcohol  1  part,  determine  the 
amount  of  hydrocyanic  acid,  and  dilute  with  a  mixture  of  water  5 
parts,  and  alcohol  1  part,  so  that  1000  parts  of  the  water  contain  HCy. 
1  part,  P.  G. — This  determination  is  made  by  mixing  27  gm.  bitter 
almond  water  and  54  gm.  water,  adding  sufficient  magnesium  hydrate 
to  render  the  mixture  opaque,  and  a  few  drops  of  solution  of  potassium 
cliromate,  and  testing  with  tenth  normal  solution  of  silver  nitrate  until 
permanent  red  color  is  just  produced.  The  number  of  cc.  of  silver 
solution  multiplied  with  '01  indicate  the  per  centage  of  HCy.  It 
may  be  remarked  that,  for  the  determination  of  the  strength  of  hydro- 
cyanic acid,  the  U.  S.  P.  has  adopted  the  same  process. 
Aqua  Aurantii  Florum,  U.  S.  Aqua  Florum  Aurantii,  P.  G. — No 
formula  in  the  latter,  merely  the  description  :  Clear  or  slightly  opal- 
escent, colorless,  of  the  agreeable  odor  of  orange  flowers ;  preserve  it 
in  a  dark  place. 
Aqua  Chlori,  U.  8.  Aqua  chlorata,  P.  G. — No  formula  in  the 
latter.  The  method  of  testing  and  the  chlorine  strength  required  are 
identical. 
Aqua  Cinnamomi. — Oil  of  cinnamon,  2  parts,  water  sufficient  for 
1000  parts,  U.  S. — Chinese  cinnamon  1  part,  alcohol  1  part,  water 
sufficient.    Macerate  for  12  hours  and  distil  10  parts.    P.  G. 
