'^'"reb"'^i88?r''""}  Fluid  Extracts  of  the  New  Pharmacopoeia.  71 
deposit;  this  menstruum  also  appears  to  best  dissolve  tlie  active  prin- 
ciple of  koosso. 
ExTRACTUM  BucHU  Fluidum. — Fluid  Extract  of  Buchu. — The 
menstruum  for  this  popular  and  efficient  fluid  extract  has  been  very 
much  changed  from  that  directed  in  the  Pharniacopceia  of  1870,  alco- 
hol s.  g.  '835  being  then  employed,  and  some  prominent  pharmacists 
recommending  that  of  s.  g.  '817  as  being  even  better  for  its  preparation. 
In  the  present  Pliarmacopoeia,  a  menstruum  com[)osed  of  alcohol  two 
parts  and  water  one  part,  is  directed  to  be  used.  This  menstruum 
furnishes  a  fluid  extract  very  much  superior  to  that  made  with  alcohol 
alone.  That  it  completely  exhausts  the  buchu  was  proved  by  the  fol- 
lowing experiment :  After  making  the  fluid  extract  the  residue  was 
dried,  and  then  it  retained  only  the  slightest  odor  of  buchu;  it  was  then 
percolated  with  alcohol  s.  g.  '822,  yielding  a  light  green  percolate  with- 
out perceptible  taste  or  odor  of  buchu  ;  this  percolate  when  evaporated 
left  a  very  small  quantity  of  tasteless,  brownish-green  extract. 
A  sample  of  fluid  extract  made  from  the  long  leaf,  had  the  specific 
gravity  of '988,  one  from  the  short  leaf '997,  and  from  equal  parts  of 
the  long  and  short  leaf  "994.  These  samples  three  years  after  being 
made  are  still  almost  free  of  precipitate,  and  otherwise  in  good  con- 
dition. 
ExTRACTUM  Calami  Fluidum. — Fluid  Extract  of  Ccdamus. — In 
this  newly-introduced  preparation,  alcohol  is  employed  as  the  men- 
struum. The  well  known  properties  of  calamus  are  here  presented  in 
a  concentrated,  elegant,  and  j^ermanent  form,  which  should  induce  its 
employment  in  place  of  other  more  expensive  aromatics  of  foreign 
origin. 
ExTRACTUM  Calumb^  Fj.vwvm.— Fluid  Extract  of  Calumba. — 
The  menstruum  directed  for  this  preparation  in  the  Pharmacopoeia  of 
1870,  was  alcohol  fourteen  fluidounces,  and  glycerin  two  fluidounces, 
finishing  the  percolation  with  a  mixture  of  two  volumes  of  alcohol 
and  one  volume  of  water.  The  present  Pharmacopoeia  directs  diluted 
alcohol  to  be  employed  ;  the  Philadelphia  College  of  Pharmacy  recom- 
mended two  parts  of  alcohol  and  one  part  of  water  as  the  menstruum 
which  possesses  the  advantage  of  percolating  freely  and  of  yielding  a 
fluid  extract  from  which  only  a  slight  precipitate  separates.  As  the 
Committee  of  Revision  have  directed  three  parts  of  alcohol  and  Uvo 
parts  of  water  as  the  menstruum  for  the  tincture  of  calumba,  it  is  diffi- 
