20  Sandalwood  and  Cedar  Oils.  {Ami£Z'isa*rm' 
rest.  The  best  results  in  double  staining  or  in  dealing  with  dark 
colored  drug  sections,  etc.,  can  only  be  obtained  by  first  bleaching 
{Pharm.  Jonrn.,  3,  xxii,  869),  and  then  carefully  removing  all 
traces  of  the  bleaching  agent  before  applying  the  stains.  In  this 
case,  of  course,  all  cell  contents  are  of  .necessity  destroyed,  and 
removed  during  the  process  of  washing. 
NOTE  ON  SANDAL-WOOD  AND  CEDAR  OILS. 
By  R.  A.  Cripps,  F.I.C. 
The  samples  which  form  the  subject  of  this  note  are  as  follows  : 
Nos.  1,  2  and  3. — Obtained  as  "  English,"  from  houses  of  repute; 
price  and  other  considerations  give  me  no  reason  to  doubt  their 
purity. 
No.  4. — Macassar  oil. 
No.  5. — A  sample  for  which  I  am  indebted  to  Mr.  R.  Wright.  It 
is  about  seventeen  years  old,  cannot  be  guaranteed  as  u  English," 
but  was  obtained  as  such. 
No.  6. — West  Indian  oil. 
Nos.  7  and  8. — West  Australian  samples  from  two  different 
dealers. 
Nos.  9  to  12. — Cedar-wood  oil  from  several  houses  of  repute. 
The  results  which  I  have  obtained  are  classified  in  the  following 
tables,  the  tests  being  applied  as  described  in  a  former  note  on  "  Oil 
of  Rosemary "  (see  Pharm.  Journ.  [3],  xxi,  p.  937),1  with  the 
exception  that  I  now  use  a  5  per  cent,  solution  of  ferric  chloride  for 
that  test,  which  I  find  usually  gives  clearer  reactions. 
To  this  series  I  have  also  added  the  saponification  test,  which  is 
carried  out  as  follows  :  About  5  grammes  of  the  sample  is  accu- 
rately weighed  into  an  Erlenmeyer  flask,  10  cc.  of  an  approximately 
semi-normal  alcoholic  solution  01  caustic  potash  added,  and  the 
whole  boiled  under  a  return  condenser  for  half  an  hour.  Side  by 
side  with  this  another  experiment  is  conducted  as  a  blank,  using 
1  For  two  drops  of  the  oil  6  drops  of  nitric  acid  were  used  ;  or  4  drops  of 
sulphuric  acid  ;  or  sufficient  of  a  5  per  cent,  solution  of  bromine  in  chloroform 
to  produce  a  faint  yellow  color  ;  in  the  latter  case,  the  mixture  is  set  aside  for 
several  hours.  Five  drops  of  the  oil  mixed  with  1  cc.  HCi,  heat  to  ebullition, 
add  4  cc.  chloroform,  set  aside  and  observe  the  color  of  the  two  layers.  Four 
drops  of  the  oil,  4  drops  of  ferric  chloride  solution  and  10  drops  of  H2S04;  after 
jo  seconds  add  5  cc.  CS2,  agitate  and  pour  into  a  white  dish. 
