112 
ON  THE  PHARMACY  OF   THE  PHOSPHATES. 
Take  of  Protosulphate  of  iron,  four  drachms  and  two  scruples. 
Phosphate  of  soda  (crystallized)  seven  drachms  and  a  half. 
Phosphate  of  lime  (recently  precipitated,)  four  drachms. 
Glacial  phosphoric  acid,  one  ounce. 
Sugar,  in  coarse  powder,  eight  ounces. 
Water  a  sufficient  quantity. 
Dissolve  the  sulphate  of  iron,  and  five  and  a  half  drachms  of  the 
phosphate  of  soda,  severally,  in  three  fluid  ounces  of  the  water, 
and  mix  the  solutions.  Wash  the  precipitated  phosphate  of  iron 
with  (cold)  boiled  water,  mix  it  with  the  phosphate  of  lime  and 
half  a  pint  of  water  in  a  porcelain  capsule,  apply  heat,  gradually 
add  the  phosphoric  acid,  continuing  the  heat  until  a  clear  solution 
is  obtained,  and  dissolve  in  it  seven  ounces  (Troy)  of  the  sugar. 
Then  dissolve  the  phosphate  of  potash,  two  drachms  of  the  phos- 
phate of  soda,  and  an  ounce  of  sugar,  in  a  fluid  ounce  of  water, 
acidulate  the  solution  with  phosphoric  acid,  and  add  it  to  the  sy- 
rupy solution  first  obtained.  A  slight  cloudiness  is  occasioned  by 
mixing  the  solutions,  which  may  be  entirely  removed,  and  the 
syrup  rendered  permanently  transparent,  by  adding  forty  drops  of 
hydrochloric  acid. 
Each  teaspoonful  of  this  syrup  contains  about  one  and  two-fifths 
gr.  of  proto-phosphate  of  iron,  two  and  a  half  grains  of  phosphate 
of  lime,  one  and  one-fifth  gr.  each  of  the  alkaline  phosphates,  and 
four  and  a  half  grains  of  free  phosphoric  acid,  which  may  be  con- 
sidered the  dose. 
The  preparations  now  in  use,  are  colored  with  cochineal  and 
flavored  with  orange  peel,  which  render  them  less  disagreeable. 
The  syrup  now  offered  may  be  so  treated  by  rubbing  up  six  grains 
of  cochineal  with  a  little  sugar,  and  adding  ten  drops  of  the  oil  of 
orange  peel  and  adding  the  mixture  to  the  syrup  and  filtering. 
ADDITION  iL  REMARKS  ON  THE  PHARMACY  OF  THE  PHOS- 
PHATES. 
By  William  Procter,  Jr. 
There  are  several  ways  in  which  phosphate  of  iron  and  other 
phosphates  may  be  prescribed  extemporaneously  in  solution,  and 
the  proportions  varied  to  suit  particular  cases.    The  therapeutic 
results  from  the  use  of  so  much  free  phosphoric  acid,  have  hard- 
