162      Formulas  from  Pharmacoposa  Oermanica.  { A Apiifi',  isS* 
is  deprived  of  bitterness  by  macerating  it  with  1  part  of  carbonate  of 
potassium,  and  sufficient  water.  The  washed  lichen  is  boiled  with 
200  parts  water  for  four  hours,  the  decoction  strained  and  with  6  parts 
of  sugar  evaporated  to  dryness ;  sufficient  sugar  is  then  added,  so  that 
the  weight  of  the  sugar  shall  be  one-half  of  the  weight  of  the  brown- 
greyish  powder. 
Infusum  Sennce  compositum.  Vienna  draught.  2  parts  of  cut 
senna  are  treated  for  five  minutes  with  12  p.  hot  water ;  dissolve  in 
the  expressed  infusion  2  p.  Rochelle  salt  and  3  p.  of  small  flake 
manna,  and  strain.    The  whole  weighs  15  parts. 
Lichen  Islandicus  ab  amaritie  liberatus.  5  parts  Iceland  moss  are 
treated  for  three  hours  with  30  p.  tepid  water  and  1  p.  solution  of  car- 
bonate of  potassium  (containing  one-third  exsiccated  carbonate) ;  the 
lichen  is  then  well  washed  with  water  and  dried. 
Linimentum  saponato-ammoniatum.  Soap  shavings,  1  part,  are 
dissolved  in  30  parts  of  water,  10  of  90  per  cent,  alcohol  and  15  parts 
water  of  ammonia. 
Linimentum  saponato-eamphoratum  is  the  old-fashioned  opodeldoc. 
Linimentum  saponato-eamphoratum  liquidum  corresponds  to  the 
soap  liniment,  U.  S.  P.,  but  contains  ammonia  and  less  than  half  the 
quantity  of  camphor.  The  proportions  are :  Castile  soap  30  p.,  68 
per  ct.  alcohol  230  p.,  camphor  5  p.,  oil  of  thyme  1  p.,  oil  of  rose- 
mary 2  p.,  water  of  ammonia  8  p. 
Liquor  Ammonii  carbonicL  Carbonate  of  ammonia  1  p.,  distilled 
water  5  parts. 
Liquor  Ammonii  pyro-oleosi,  of  the  same  strength,  is  made  with 
pyro-oleous  carbonate  of  ammonium. 
Liquor  Ferri  acetici.  Dilute  10  p.  solution  of  tersulphate  of  iron 
with  30  p.  of  water,  and  mix  with  8  p.  ammonia  water,  previously 
diluted  with  160  p.  water ;  the  mixture  must  have  an  alkaline  reac- 
tion. The  precipitate  is  carefully  washed  with  distilled  water  and 
expressed  in  a  linen  strainer  until  the  residue  weighs  about  5  parts  ; 
this  is  left  in  contact  with  6  p.  acetic  acid,  sp.  gr.  1*040,  for  several 
days,  in  a  cool  place,  with  occasional  agitation,  filtered  and  sufficient 
distilled  water  added  to  make  the  solution  weigh  10  parts. 
The  liquid  has  a  deep  brown-red  color,  becomes  turbid  on  heating, 
has  a  specific  gravity  of  1-134  to  1*138  and  contains  8  per  cent,  of 
iron. 
