66  Analysis  of  Pycnanthemum  Lanceo datum. {Am> 
The  results  of  the  analysis  may  be  tabulated  as  follows : 
Per  Cent. 
Moisture,   8*96 
Ash,   577 
Benzol  extract  : 
Ethereal  oil,    1-47 
Substance  not  volatile  at  noc  : 
Soluble  in  hot  alcohol,   1*20 
Insoluble  in  hot  alcohol,   72 
  1*92 
  3  "39 
Ether  extract,   '90 
Alcohol  extract,  .  .  \   1*45 
Aqueous  extract  : 
Mucilage,  .  .  .  70 
Glucose,   -37 
Undetermined,   4-60 
  5'67 
Alkaline  aqueous  extract : 
Albuminoids,  etc.,  precipitated  by  alcohol,  1*26 
Undetermined,   4*47 
  573 
Acid  aqueous  extract : 
Pararabin,   '43 
Other  organic  substance,   72 
  i*i5 
Inulin,   -35 
Lignin,  etc.,  removed  by  chlorine  water,  etc.,   23*95 
Cellulose,  etc.,   36*09 
Loss,   6-59 
100  *oo 
The  moisture  was  estimated  by  d^/ing  at  no°;  the  amount 
stated  consequently  includes  a  part  of  the  ethereal  oil. 
The  benzol  extract  was  of  an  olive  green  color,  and  on  evapora- 
tion of  the  solvent,  left  a  semi-solid  residue,  having  the  odor  of  the 
ethereal  oil.  This  was  first  dried  at  100°,  and  weighed;  then 
brought  to  very  nearly  constant  weight  at  1  io°,  the  intention  being 
to  take  the  difference  between  these  two  weights  as  the  weight  of  the 
ethereal  oil ;  but,  as  the  percentage  thus  found  was  far  lower  than 
the  percentage  of  ethereal  oil  actually  obtained  in  distilling  a 
quantity  from  the  air-dry  herb,  it  being  less  than  one- fifth  as 
great,  the  latter  was  considered  more  nearly  correct,  and  is  the 
percentage  stated  in  the  table. 
The  residue  non-volatile  at  no°  was  treated  with  hot  absolute 
