of  0.925  at  20®.  The  rotatory  power  could  not  be  taken  on  account  of  the
dark  color  of  the  oil.     A  volumetric  estimation  of  thymol  was  made.*

(i)     (a)  4.4580  gm.  of  oil  diluted  to  13.0  Cc.  with  petroleum  ether,  and  shaken  with

5  per  cent,  soda  solution  until  volume  of  ether  solution  remained  unchanged

and  thymol  was  no  longer  indicated  by  FlUckiger's  reagent.
Loss  uf  volume,  3.0  Cc.  —  61.22  per  cent,  phenol.
(^)  Alkaline  solution  of  thymol  diluted  to  100  Cc.  with  5  per  cent,  soda  solution.
(a)   10  Cc.  of  this  solution  required  73.5  j.^^  I.  sol.  for  precipitation  of

phenol,  hence  75.3  X  0.C037415  ^=61.68  per  cent  thymol
(/J)  A  duplicate  test  gave  identical  results.
(2)     (a)  5.7887  gm.  diluted  to  13.3  Cc.  lost  3.9  Cc,  hence  61.9  per  cent,  phenol  present.
(d)  Alkaline  solution  of  thymol  diluted  to  100  Cc.  with  5  per  cent,  soda  solution,
(a)  10  Cc.  required  95X)  ^"^   I.  sol.  for  precipitation  of  phenol,  hence

present  61.4  per  cent,  thymol.
Q3)  A  duplicate  test  gave  identical  results.
TABLE  OF  RESULTS.
Shaking-out  Process.  As  Thymol  Iodide.
Experiment  1 61.22  per  cent.  61.68  per  cent.
Experiment  2 61.9    per  cent.  61.4    per  cent.
REFERENCES.
1.  Proceedings  American  Pharmaceutical  Association,  vol.  43,  p.  256,  1895.
2.  Pharmaceutische  Rundschau,  vol.  [3,  p.  207, 1895.
3.  Annalen  d.  Chem.  u.  Pharmacie.,  58,  p.  41.
4.  American  Journal  of  Pharmacy,  x,  p.  113.
5.  Die  Fluchtigen  Oele,  p.  372.
6.  F.  A.  Fliickiger,  Reactionen,  p.  156.
JPharm.  Chem,  Laboratory^  Univ.  of  Wisconsin,

*  For  the  details  of  this  process  compare  the  volumetric  estimation  of  phenols  by  £.
Kremers  and  O.  Schreiner.
16


242  MINUTES  OF  THE  SCIENTIHC  SECTION.
ON  THE  CHEMICAL  COMPOSITION  OF  THE  OIL  OF  MONARDA

FISTULOSA  (L).
