AmNJo0vU^87h6!rm•}  The  different  Syrups  of  the  Phosphates.  493, 
marks  on  this  article,  and  the  somewhat  similar  one  of  Easton's  Syrup, 
which  is  also  difficult  to  make  and  to  keep  in  good  condition.  I  begin 
with  Parrish's  Syrup  as  perhaps  the  most  difficult  to  make  according  to 
the  ordinary  formula. 
The  chief  reason  for  the  difference  met  with  in  the  various  makes  of 
this  preparation  is  to  be  found  in  the  fact  that  the  principal  published 
formula,  that  in  Parrish's  "  Pharmacy,"  is  an  utterly  unpractical  one. 
It  is  well  known  that  glacial  phosphoric  acid,  uncontaminated  with 
phosphate  of  soda,  is  hardly  to  be  found  in  the  market  at  present  ;  but 
even  if  it  were,  it  is  next  to  impossible  to  obtain  a  good  preparation 
with  it,  as  it  is  a  monobasic  acid,  while  the  direction  to  add  "  quantum 
sufficit  "  of  hydrochloric  acid  is  exceedingly  vague.  But  apart  from 
this,  it  is  evident  that  the  formula  cannot  be  strictly  followed,  as  if  the 
quantity  of  ferrous  phosphate  directed  to  be  present  in  each  fluidrachm 
of  the  completed  syrup  is  attended  to,  32  troyounces  of  sugar 
will  have  to  be  made  into  36  fluidounces  of  syrup — a  manifest 
impossibility  ;  while,  if  the  quantity  given  as  the  amount  of  solu- 
tion to  be  formed  for  the  sugar  to  be  dissolved  in  is  adhered  to,  the 
result  will  be  about  46  fluidounces  of  syrup,  which  will  not  contain  the 
requisite  amount  per  drachm  of  iron  and  lime.  All  the  formulae  at 
present  in  use  seem  merely  modifications  of  that  given  by  Parrish.  In 
the  following  form  the  author  has  only  followed  Parrish  as  far  as  the 
result  to  be  obtained  is  concerned,  viz.,  that  the  finished  syrup  shall 
contain  in  each  fluidrachm  1  grain  ferrous  phosphate  Fe3P208, 
grains  calcic  phosphate  Ca3P208,  and  traces  of  sodic  and  potassic  phos- 
phates, with  free  phosphoric  acid. 
Take  of    Iron  wire,  clean,  No.  20,    .  .  240  grains  5 
Syrupy  phosphoric  acid  (sp.  gr.  i-75),  3  oz.  by  weight  5 
Water,  distilled,  ...         4  fluidounces. 
Mix  the  acid  and  water,  and  dissolve  the  wire  in  the  mixture  in  a 
flask,  loosely  stopped  with  tow  ;  the  hydrogen  evolved  then  protects 
the  solution  from  oxidation.  When  all  action  has  ceased,  heat  to 
boiling  point,  and  filter  through  paper  in  .a  funnel  with  a  long  neck 
reaching  to  the  bottom  of  a  beaker  containing  a  little  syrup,  which 
floating  on  the  iron  solution  will  effectually  prevent  any  oxidation. 
Slaked  lime,  fresh,  .  .  923  grains  ; 
Phosphoric  acid  (sp.  gr.  175),  .  9^  oz.  by  weight. 
Water,  distilled,  .  .  .     14  fluidounces. 
