420  Oil  of  Erigeron  Canadense.  {AmsiX'i89h3arm' 
assuming  that  the  benzoyl  radical  replaces  the  hydrogen  of  the 
other  hydroxyl  group,  besides  that  of  the  oxyimido  group. 
CH3  CH3  CH3  CH3  CH3  CH3 
V  V  V 
H  CH  H  CH  H  CH 
V  V  V 
c  c  c 
H  /  x  H 
H2C    CH  H2C  H2C  Cqh 
H       _T™™    I  ",H 
0=C    CH       HO-N=C    C„       C6H5COON=C  CH 
c  c  c 
A  A  A 
H  CH3  H  CH3  H  CH3 
Pulegone.  Pulegoneoxime.  Benzoylester  of  Pulegoneoxime. 
A  cabinet  specimen  of  American  pennyroyal  oil,  which  had  been 
standing  for  ten  years,  also  yielded  pulegoneoxime  though  not  as 
readily. 
The  oil  used  in  these  experiments  had  been  kindly  furnished  by 
Messrs.  Fritzsche  Bros,  of  New  York. 
Pharm.  Laboratory,  Univ.  of  Wisconsin,  Madison. 
OIL  OF  ERIGERON  CANADENSE  (Linne).1 
By  Fritz  W.  Meissner. 
The  first  investigations  of  this  oil,  in  regard  to  its  general  proper- 
ties, as  well  as  its  boiling  point  and  specific  gravity,  were  made  by 
Procter2  in  1884.  In  1881,  Vigier  and  Cloez3  made  a  more  careful 
examination  of  the  oil  and  determined  its  specific  gravity  to  be  0-848 
at  10°  C.  and  that  it  boiled  between  175—176°  C. 
They  were  also  the  first  to  ascertain  its  composition,  which  they 
found  to  be  C]0H16.  In  its  action  toward  polarized  light,  they  found 
the  angle  of  polarization  to  be  -f-  16-15°.  With  hydrogen  chloride 
they  obtained  a  dihydrochloride  of  the  composition  C10H162HC1. 
1  Read  at  the  meeting  of  the  Wis.  Pharm.  Assoc.,  in  Fond  du  Lac,  August 
1893- 
2  Am.  Journ.  Pharm.,  Vol.  XXVI,  p.  502. 
3  Am.  Journ.  Pharm.,  1881,  p.  12,  and  Journ.  de  Pharm.,  IV,  p.  236. 
