280 
Oil  of  Camphor. 
Am.  Jour.  Pharm. 
June,  1889. 
Vapor  density  : 
I.  0*083  gm.  subst,  replaced  13*5  cc.  air  ==  5*28. 
II.  0-115  "     "  "      18-9  cc.  air  =  5*23. 
Calculated  for  C10H16O  =  5*26. 
Fraction  K  212-214°  C.,  b.  p.  213°  C— The  portion  boiling  at 
208-220°  C.,  on  rectification,  gave  a  fraction  boiling  at  212-214°  C. 
Before  it  was  rectified  it  was  placed  in  a  freezing  mixture,  the  sepa- 
rated camphor  removed,  and  on  redistilling  more  camphor  separated 
out  in  the  receiver.  This  was  the  case  invariably  on  redistilling  the 
oil  after  the  camphor  had  been  removed.  On  separating  the  camphor 
as  near  as  possible  by  the  use  of  a  freezing  mixture,  the  fraction  boil- 
ing at  212-214°  C.  gave  the  following  results,  corresponding  to  the 
formula  C10H18O2. 
It  was  colorless,  of  mild  camphor  odor,  sp.  gr.  0*9802  at  16°  C, 
and  dextro -rotary  =  -f-  53*4°. 
Combustions : 
1.  0*1830  gm.  subst,  gave  0*4750  gm.  C02  and  0*1717  gm.  H20. 
II.  0*1935   "     u       "    0*5010   "    C02  and  0*1840  gm.  H20. 
Calculated  for  C10H1S02. 
Found. 
I. 
II. 
C-70  59 
H— 10-59 
0-18-82 
70-78 
1043 
18.79 
70-61 
10-56 
1883 
100-00 
100-00 
100-00 
Vapor  density  : 
I.  0*1620  gm.  subst.  replaced  23*5  cc.  air  =  5'92. 
11.0*1540   "      "  "       22-5  cc.  air  =  5*88. 
Calculated  for  C10H18O2  =  5*89. 
Fraction  P.  230-235°  C,  b.  p.  232°  C. 
It  was  with  great  difficulty  that  a  compound  with  constant  boiling 
point  was  obtained,  and  when  obtained,  it  was  found  still  to  exert  a 
perceptible  action  on  polarized  light.  As  by  simple  fractionation  the 
desired  result  could  not  be  obtained,  several  litres  were  treated  with 
an  aqueous  solution  of  potassium  hydrate,  and  the  light  portion  dis- 
tilled off  in  a  vacuum.    From  that  remaining  in  the  still,  the  aqueous 
