Am.  'our.  Pbarm. 
June,  1906. 
American  Pharmacopceia. 
d^o  1-065  to  1-075  ;l  amh°  not  above  +  4°;  soluble  in  every  pro- 
portion in  90  per  cent,  alcohol.2 
Savin  Oil  ( Oleum  sabince). — Colorless  or  yellowish  ;  d25o  0-903  to 
0-923  ;  #D25o  -f-  40  -f-  6oc  ;  soluble  in  about  0-5  volumes  and  more 
90  per  cent,  alcohol. 
Spearmint  Oil  (Oleum  menthce  viridis). — Colorless,  yellow,  or 
greenish  yellow  ;  d25o  0914  to  0-934  i  ^25°  —  35  to  —  4^°j  w*tn  an 
equal  volume  80  per  cent,  alcohol  it  forms  a  clear  solution  which 
becomes  cloudy  when  further  diluted. 
Sweet  Orange  Oil  (Oleum  auranth  corticis). — Faintly  yellow  ;3 
d25o  0842  to  0  846;  tfD25o  not  below  -f  950.4 
Thyme  Oil  (Oleum  thymi). — Colorless;5  d25o  0-900  to  0930  ;6 
feeble  Isevorotation,  tfD25o  not  above  —  30  ;7  phenol-content  at  least 
20  per  cent,  by  volume  ;  soluble  in  0.5  vol.  alcohol  and  in  1  to  2  vol. 
80  per  cent,  alcohol. 
Thymol. — Large  colorless,  transparent  rhombic  prisms;  d25o  1030; 
melting  point  50  to  510  ;  the  alcoholic  solution  is  optically  inactive. 
Turpentine  Oil  (Oleum  terebinthince) — Colorless;  d25o  0860  to 
0  870 ;8  on  distillation,  the  bulk  should  pass  over  between  155  and 
1620;  soluble  in  3  vol.  alcohol. 
Turpentine  Oil,  rectified  (Oleum  terebinthince  rectificatunt)  — 
Colorless;  d25o  o-86o  to  0  865.9 
1  For  the  lower  limit  of  value,  1*063  is  more  suitable  (comp.  table). 
2  Not  every  oil  answers  this  requirement.  We  have  again  recently  found  in 
one  of  our  own  distillates,  that  1  to  2  vol.  90  per  cent,  alcohol  are  required  to  dis- 
solve 1  vol.  sassafras  oil  ;  this  observation  agrees  with  those  repeatedly  made 
with  good  commercial  oils.    Comp.  also  the  April-May  Report,  p.  61. 
3  The  color  of  orange  oil  is  yellow  to  yellow-brown. 
4  Calculated  for  200,  the  rotation  is  +  960  ;  we  have  observed  as  lowest  value 
at  200  +  950  30'. 
5  The  rectified  oils  also  frequently  acquire  again  the  red-brown  color  of  the 
crude  oil. 
6  0-900  is  too  high  as  lowest  limit  of  value,  and  this  should  be  0*894  (comp. 
table). 
7  We  have  also  repeatedly  o  bserved  oils  with  a  feeble  dextrorotation  ;  further, 
the  rotation  is  sometimes  a  little  higher  than  indicated  in  the  Pharmacopceia. 
In  most  cases,  the  optical  behavior  of  the  oil  can  only  be  determined  approxi- 
mately on  account  of  the  dark  color. 
8  It  would  be  more  correct  to  fix  0  858  as  the  lowest  limit  of  value  (comp. 
table). 
9  The  lower  limit  applies  to  a  temperature  of  15°  ;  for  250  it  is  0*853  (comp. 
table). 
