"^""•(/crisS.^"'-}    Absorftion  of  Moisture  by  Glycerin,  485 
Mix  the  drugs,  and  having  moistened  them  with  the  glycerin  and 
■quantity  sufficient  of  the  diluted  alcohol,  pack  in  a  conical  percolator 
ind  displace  with  a  menstrum  of  dilute  alcohol ;  set  aside  the  first  three 
ounces,  and  continue  percolation  until  exhausted.  Evaporate  until 
reduced  to  one  fluidounce,  and  when  cold  mix  with  first  percolate,  and 
filter. 
Aromatic  Glycerole  of  Cinchona. 
Take  equal  bulks  of  glycerole  of  cinchona  and  aromatic  glycerole  of  licorice  ; 
mix  them,  and  filter  if  necessary. 
Any  of  the  above-mentioned  glyceroles  can  be  reduced  to  any  desired 
strength  by  diluting  with  a  menstruum  composed  of  two  parts  of  alco- 
hol and  one  of  water.  Should  the  reduced  preparation  show  any  inclina- 
tion to  precipitate,  it  is  advisable  to  add  a  small  portion  of  glycerin  to 
the  menstruum  used  in  making  the  dilution. 
QUILLAIA    TOOTH  WASH. 
By  Alexander  E.  Bennett,  Ph.G. 
From  an  Essay  on  the  Uses  of  Glycerin. 
An  excellent  toothwash  containing  glycerin  is  made  as  follows : 
Take  of    Soap  bark,  ground,  ,  .  .    4  oz. 
Glycerin,     .  .  .  3  oz. 
Diluted  alcohol,  .  sufficient  for  2  pints 
Oil  of  gaultheria,  oil  of  pepperininr,  each,       20  drops 
Macerate  the  soap  bark  in  the  mixture  of  g  vcerin  and  diluted  alcohol 
for  three  or  four  days,  and  filter  through  a  little  magnesia  previously 
triturated  with  the  volatile  oils. 
Thus  made,  a  much  better  preparation  is  obtained  than  by  macerat- 
ing the  bark  in  the  dilute  alcohol,  and  adding  the  glycerin  afterwards. 
ABSORPTION  OF  MOISTURE  BY  GLYCERIN.^ 
By  George  Eli  Williams,  Ph.G. 
From  an  Inaugural  Essay. 
The  property  possessed  by  glycerin  of  absorbing  moisture  is  well 
.known.     To  determine  its  rapidity  under  different  circumstances  the 
following  experiments  were  undertaken  : 
^  See  also  "  American  Journal  of  Pharmacy,"  1879,  p.  313  and  513. 
