ON  SYRUP  OF  PHOSPHATE  OF  LIME. 
411 
sufficient  to  make  the  whole  measure  a  pint)  is  added,  and  the  fluid 
extract  passed  through  a  fine  muslin  strainer. 
This  preparation  affords  an  admirable  means  of  prescribing 
henbane  in  fluid  preparations.  The  alcohol  of  the  tincture  is 
avoided,  and  the  trouble  of  incorporating  the  solid  extract  super- 
seded. It  is  of  the  same  proportional  strength  as  the  fluid  extract 
of  valerian,  and  the  dose  varies  from  15  drops  to  half  a  teaspoonful, 
the  latter  dose  being  equivalent  to  two  or  three  grains  of  extract. 
When  the  apothecary  has  in  possession  solid  extract  of  hyoscya- 
mus  of  ascertained  good  quality,  a  fluid  extract  of  similar  strength 
may  be  obtained  by  triturating  half  an  ounce  of  the  extract  with 
ten  fluid  ounces  of  water  till  dissolved; — eight  ounces  of  sugar  dis- 
solved in  it,  and  finally  sufficient  alcohol  to  make  it  measure  a  pint, 
and  strain.  Practically,  henbane  yields  but  5  per  cent,  of 
extract ;  the  above  recipe  assumes  it  to  be  6J  per  cent. — a  differ- 
ence altogether  proper  in  view  of  the  possible  injury  to  the  juices 
in  preparing  the  extract  originally. 
ON  SYRUP  OF  PHOSPHATE  OF  LIME. 
By  A.  B.  Durand. 
Having  been  requested  by  a  medical  friend  to  prepare  a  syrup 
of  phosphate  of  lime,  I  undertook  a  series  of  experiments  in  order 
to  ascertain  the  best  means  of  making  such  a  preparation  ;  and 
have  adopted  the  following  formula  as  the  most  eligible  for  ac- 
curacy and  facility,  as  also  for  the  superiority  of  the  product. 
Thinking  that  some  of  the  readers  of  the  Journal  may  find  it  use- 
ful, the  formula  is  at  their  disposal  : 
Take  of  Precipitated  phosphate  of  lime,         128  grains. 
Glacial  phosphoric  acid,  240  grains. 
Sugar,  in  coarse  powder,  7J  oz.,  (Troy.) 
Distilled  water,  4  fluid  ounces. 
Essence  of  lemon,  12  drops. 
Mix  the  phosphate  of  lime  with  the  water,  in  a  porcelain  capsule* 
over  a  spirit  or  gas  lamp,  or  in  a  sand  bath,  add  gradually  the 
phosphoric  acid  until  the  whole  of  the  phosphate  of  lime  is  dis- 
solved. To  this  solution  add  sufficient  water  to  compensate  for 
the  evaporation ;  then  dissolve  the  sugar,  by  a  very  gentle  heat, 
and,  when  perfectly  cold,  add  the  essence  of  lemon. 
