276 
Oil  of  Camphor. 
Am.  Jour.  Pharm. 
June,  1889. 
It  had  better  be  explained  that  the  fractions  P,  Q,  E  and  S  were  not 
the  result  of  fractional  distillation  alone,  but  were  obtained  by  treat- 
ment to  be  hereafter  explained  from  fresh  portions  of  the  oil.  Only 
those  fractions  having  constant  boiling  points  were  examined.  All 
the  polariscope  readings  were  made  in  the  200  mm.  tube,  confirmed 
by  the  use  of  the  100  mm.  tube.  The  vapor  densities  were  made  with 
the  Victor  Meyer  apparatus.  The  combustions  were  carried  out  in 
an  open  tube  with  cupric  oxide  and  a  stream  of  oxygen.  Over  ninety 
combustions  were  made  during  the  progress  of  the  work  which  has 
been  carried  on  uninterruptedly  since  last  December. 
Fraction  A.  145-155°  C. — This  fraction  was  found  only  in  small 
quantity,  having  strong  terebinthinate  odor,  of  sp.  gr.  0*8593  at  16°  C, 
and  dextro-rotary  =  -{-53°.  It  was  submitted  to  combustion  with 
following  results : 
I.  0*100  gm.  substance  yielded  0'3235  gm.  C09  and  0*106  gm. 
H20. 
II.  0'141  gm.  substance  yielded  0#453  gm.  C02  and  0.146  gm. 
H20. 
Calculated  for  C10H16. 
Found. 
i. 
II. 
C— 88-23 
H— 11-77 
88-22 
11-77 
87-62 
11-51 
100-00 
99-99 
99-13 
Vapor  density : 
I.  0'1152  gm.  subst.  vaporized  replaced  21  cc.  air  =4*70. 
II.  0-1012  "       "  "       .  "       18-lcc.  "  =4-73. 
Calculated  for  C10H16.=4-71. 
Fraction  B.  158-161°  C,  b.  p.  159°  C— This  fraction  of  constant 
boiling  point  possessed  fragrant  and  terebinthinate  odor,  of  sp.  gr. 
0-8616  at  16°  C,  and  dextro-rotary =+54°. 
Combustions  as  follows : 
I.  0-109  gm.  subst.  yielded  0"350  gm.  C02  and  0'114  gm.  H20. 
II.  0-111  "       "         "       0-358  "  C02  and  0-1175  "  H2Q. 
