Am.  Jour.  Pharm.  \ 
April.  1388,  / 
Oil  of  Pennyroyal. 
167 
II.  Other  portions  of  these  fractions  were  shaken  with  ether,  and 
saturated  with  dry  hydrochloric  acid  gas  (See  O.  Wallach,  in  ^'Annalen 
der  Chemie/'  vol.  239,  1),  but  with  no  better  result. 
III.  Other  portions  Avere  shaken  with  glacial  acetic  acid  and  sat- 
urated with  dry  hydrochloric  acid  gas,  with  the  same  result  as  before. 
EXPERIMENTS  WITH  ZINC  DUST  AND  METALLIC  SODIUM. 
Several  light  fractions  were  treated  with  these  substances  separately 
and  distilled,  with  a  view  of  obtaining  a  hydrocarbon  if  possible,  but 
without  success.  The  residue  left  in  the  still  was  a  yellowish,  sticky 
mass,  showing  a  decomposition  of  oil.  Two  ultimate  analyses  were 
made  of  a  fraction  boiling  between  180°-185°C.  as  follows : 
In  the  first  0*1125  grams  and  in  the  second  0*1175  grams  of  oil  were 
used. 
The  formula  corresponding  most  nearly  is  C23H39O. 
Found. 
Calculated. 
I. 
C.    83.44  per  cent. 
H.  11.85 
0.  4.71 
II. 
83.37  per  cent. 
11.63 
5.00 
Average. 
83.405  per  cent. 
1L740 
4.855 
forC23H390. 
83  38  per  cent. 
11.78 
4.84 
100.00  per  cent.      100.00  per  cent.      100.000  per  cent.    100.00  per  cent. 
Summary. — The  results  of  the  analysis  may  be  summarized  as  fol- 
lows : 
I.  A  body  of  the  composition  of  CioHigO,  boiling  from  217°- 
218°C.  and  constituting  about  33%  of  the  original  oil. 
II.  A  body  of  the  composition  of  CjoHi^O,  boiling  from  220°- 
225°C.  and  constituting  about  12%  of  the  oil. 
III.  A  body  of  the  composition  of  CgHigO,  boiling  from  165°- 
170°  and  constituting  about  0.7%  of  the  oil. 
IV.  Formic  acid  existing  in  a  free  state  about  0.5  %. 
V.  Acetic  acid  also  in  a  free  state  a  small  quantity  only. 
Specimens  of  seven  different  fractions  and  also  the  decomposition 
product,  obtained  on  distilling  the  oil  which  had  been  treated  with 
metallic  sodium,  are  handed  in  with  this  essay. 
The  oil  was  obtained  from  a  reliable  wholesale  house  of  this  city^ 
and  known  to  be  pure. 
The  investigation  was  conducted  in  the  chemical  laboratory  of  the 
Philadelphia  College  of  Pharmacy,  and  under  the  supervision  of  Pro- 
fessor Henry  Trimble. 
Note  by  the  Editor. — In  the  October  number  (1887)  of  this  Journal, 
