224 
ON  HYPOPHOSPHITE  OF  LIME. 
besides  the  process  does  not  need  to  be  watched  all  the  time ;  to 
be  stirred  occasionally  is  all  that  is  required. 
I  did  not  examine  whether  any  phosphate  of  lime  is  formed, 
and  if  there  is  any,  how  much  ;  but,  no  doubt,  its  quantity  is  not 
considerable,  as  the  yield  in  hypophosphite  is  so  much  greater. 
By  boiling  the  phosphorus  with  lime,  I  am  sure  it  is  for  the  most 
part  the  excess  of  lime,  which,  by  a  boiling  heat,  decomposes 
hypophosphite  already  formed,  and  converts  it  into  phosphate 
with  evolution  of  hydrogen  gas,  and  that  this  is  the  reason  why 
the  product  is  so  little. 
Louisville,  Ky.,  April  4,  1858. 
COMPOUND  SYRUP  OF  PHOSPHATES. 
By  E.  Scheffer. 
According  to  the  formula  given  in  the  last  number  of  the 
Journal  of  Pharmacy,  1857,  the  Compound  Syrup  of  Phosphates 
should  contain,  besides  the  other  ingredients,  twelve  drachms  of 
phosphate  of  lime,  dissolved  in  twenty  drachms  of  glacial  phos- 
phoric acid.  If  the  glacial  phosphoric  acid  in  commerce  was 
always  PO5,  HO — the  monohydrate  of  phosphoric  acid — the  for- 
mula would  be  all  right,  but  as  it  contains  mostly  more  water 
than  the  monohydrate,  the  syrup  will  always  vary  more  or  less 
in  its  quantity. 
I  propose,  therefore,  a  method  which  does  not  interfere  at  all 
with  the  formula  given  by  Mr.  Parrish,  and  does  not  alter  the 
proportion  of  the  ingredients,  but  which  will  always  give  the 
same  compound,  and  which  will  recommend  itself  by  being  a 
great  deal  cheaper  and  very  easily  made. 
I  start  with  the  supposition,  that  twenty  drachms  of  glacial 
phosphoric  acid  in  that  formula  shall  be  the  monohydrate  of 
phosphoric  acid. 
Twenty  drachms  of  PO5,  HO  correspond  to  17.76  PO5,  anhy- 
drous phosphoric  acid.  These  17.76  PO5  are  contained  in  37.25 
phosphate  of  lime,  and  37.25  phosphate  of  lime  contain  19.50 
lime,  which  require  34.125  drachms  SO3,  HO,  the  monohydrate 
of  sulphuric  acid,  to  form  sulphate  of  lime. 
I  take  now  49.25  drachms  phosphate  of  lime,  and  34.125  suL 
