544  State  Pharmaceutical  Associations.  {^yeZ^m^' 
Oil  of  Sweet  Birch,  Oil  of  Wintergreen,  and  Methyl  Salicy- 
late.— The  polariscope  is  the  only  means  of  differentiation  officially 
given  and  is  not  conclusive  nor  always  possible  of  application  by  the 
retail  pharmacist. 
Oil  of  Caraway. — With  the  exception  of  the  polariscope  test,  the 
pharmacist  can  readily  apply  the  others  satisfactorily. 
Oil  of  Cloves  and  Oil  of  Pimenta. — The  assay  for  eugenol  is 
simple,  a  long  necked  flask  graduated  in  i-io  c.c.  being  the  only 
apparatus  required. 
Oil  of  Chenopodinm. — The  constants  and  tests  have  been  omitted 
in  the  corrected  edition  of  the  U.S. P.,  therefore  must  be  judged  by 
its  physical  characters. 
Oil  of  cinnamon  can  be  easily  tested,  the  quantitative  deter- 
mination of  cinnaldehyde  made  by  using  graduated  flask  as  men- 
tioned under  oil  of  cloves.  The  sodium  bisulphite  used  should  be 
fresh,  if  proper  results  are  to  be  obtained,  difficulties  met  with  in 
this  estimation  generally  being  due  to  lack  of  care  in  this  respect. 
Oils  of  copaiba,  coriander,  cubeb,  erigeron,  fennel,  hedeoma, 
juniper,  lavender  -flowers,  myristica,  savin,  sassafras,  spearmint, 
and  tar,  with  the  exception  of  the  polariscope  test,  can  be  readily 
tested  by  the  pharmacist. 
Oil  of  Eucalyptus. — The  physical  properties  and  test  for  phel- 
landrene-containing  oils  is  all  that  the  pharmacist  has  upon  which 
to  judge,  the  other  testing  requiring  laboratory  facilities  and  skilful 
manipulation. 
The  citral  test  under  oil  of  lemon  is  one  requiring  skilful  manipu- 
lation and  the  writer  advises  the  pharmacist  not  to  waste  his  time 
with  it. 
Oils  of  Peppermint,  Rosemary,  and  Sandalwood. — The  acetyliza- 
tion  test  is  so  complicated  and  requires  so  much  special  apparatus 
that  none  but  skilled  laboratory  workers  can  satisfactorily  apply  it. 
Oil  of  rose  is  not  difficult  to  test  but  rather  expensive,  as 
from  5  to  10  c.c.  of  the  oil  is  needed.  Better  for  the  pharmacist  to 
rely  upon  the  guarantee  of  his  wholesaler. 
Oil  of  Mustard. — The  assay  for  allylisothiocyanate  takes  up  too 
much  time ;  the  other  tests  are  not  too  difficult  for  the  average 
pharmacist. 
Oil  of  Turpentine. — Tests  are  easily  applied,  but  there  is  neces- 
sity for  a  time  limit  in  connection  with  the  test  for  hydrocarbon  oils. 
If  the  mixture  is  allowed  to  stand  over  night  to  separate,  no  oil 
