A  ocSer^or-}       Alkaloidal  Assays  of  the  U.S.P.  457 
Fluidextractum  Conii. — The  remarks  on  conium  apply  also  to 
its  fluid  extract. 
Fluidextractum  Guaranae. — Method  very  good. 
Fluidextractum  Hydrastis. — The  method  can  hardly  be 
improved. 
Fluidextractum  Hyoscyami. — Same  remarks  as  under  fluid 
extract  of  belladonna  root. 
Fluidextractum  Ipecacuanhae. — As  said  before,  I  find  the  method 
unworkable.1 
Fluidextractum  Nucis  Vomicae. — The  evaporation  of  the  alcohol 
from  the  fluid  extract  is  unnecessary.  The  method  can  be  made 
much  simpler  by  shaking  out  directly  10  or  5  c.c.  of  the  fluid  extract 
with  immiscible  solvents  in  presence  of  alkali. 
With  regard  to  the  addition  of  amyl  alcohol  see  extract  of  nux 
vomica. 
Fluidextractum  Pilocarpi. — The  method  is  unnecessarily  com- 
plicated and  could  be  very  easily  replaced  by  a  simpler  one. 
Fluidextractum  Stramonii. — Same  remarks  as  under  fluid 
extract  of  belladonna  root. 
Guarana. — The  method  is  very  good. 
Hydrastis. — Use  of  percolator  shaking-tube  mentioned  under 
belladonna  would  be  advantageous. 
Hyoscyamus. — Same  remarks  as  for  belladonna  leaves. 
Ipecacuanha. — Use  of  percolator  shaking-tube  would  be  advis- 
able. 
Nux  Vomica. — Same  remarks  as  for  ipecac.  For  the  use  of  amyl 
alcohol  see  extract  of  nux  vomica. 
Physostigma. — Same  remarks  as  for  ipecac. 
Pilocarpus. — Same  remarks  as  for  ipecac. 
Scopola. — Same  remarks  as  for  belladonna  leaves. 
Tinctures. — As  by  concentration  tinctures  are  converted  into 
fluid  extracts,  the  remarks  concerning  the  latter  also  apply  to  the 
tinctures. 
Northwestern  University  School  of  Pharmacy. 
1  See  footnote  to  aconite. 
