20       v  COMPOUND  SYRUP  OF  PHOSPHATES. 
f.  ffz. 
3  ss. 
Biv. 
f.Sij, 
q.  s. 
ron  by  the  pyro- 
sulting  in  the  production  of  the  following  formula  for  that  com- 
pound : 
R.    Solution  of  Persulphate  of  Iron,  U.  S.  P., 
(containing  3iv.  in  Oj.,) 
Pyrophosphate  of  Soda,  . 
Phosphate  of  Lime,  . 
Phosphate  of  Soda,  (rhombic) 
Phosphate  of  Potassa,  of  each 
Hydrochloric  Acid,  . 
White  Sugar, 
Citric  Acid,  . 
Solution  of  Ammonia,  of  each, 
Precipitate  the  solution  of  persulphate  of 
phosphate  of  soda,  dissolved  in  about  f.g  viij.  of  water,  wash  the 
precipitate,  triturate  it  with  ^ij.  of  citric  acid,  and  gradually  add 
ammonia,  until  the  liquid  becomes  clear  and  slightly  alkaline  ; 
then  dissolve  the  phosphate  of  lime  in  the  hydrochloric  acid, 
precipitate  by  liquor  ammonia,  filter,  wash  the  precipitate,  and 
while  still  moist,  triturate  with  Bviij.  citric  acid  and  let  stand 
until  it  becomes  clear  :  mix  with  this  the  above  solution  of  pyro- 
phosphate of  iron,  neutralize  with  liquor  ammonia  and  slightly 
acidify  with  eight  grains  of  citric  acid.  Pulverize  the  phosphates 
of  soda  and  potassa  and  dissolve  them  in  this  liquid,  filter  if 
necessary,  add  the  sugar,  whose  solution  is  to  be  effected  by 
agitation  without  the  aid  of  heat,  and  lastly  dilute  with  sufficient 
water  to  make  the  whole  measure  f.  3xvj. 
As  thus  prepared  the  syrup  is  of  a  fine  light  green  color,  with 
a  saline  and  slightly  aromatic  taste,  but  quite  free  from  the  dis- 
agreeable styptic  astringency  of  most  of  the  ferruginous  com- 
pounds :  if  preferred,  it  may  readily  be  colored  by  cochineal, 
and  flavored  with  a  tincture  of  orange  peel,  &c. 
The  chief  peculiarity  of  this  process,  i.  e.,  the  employment  of 
citric  acid  instead  of  phosphoric,  as  a  solvent  for  the  phosphate 
of  lime,  may  prove  an  advantage  as  diminishing  the  cost  of  the 
preparation. 
Philadelphia,  Dee.  1857. 
