264  Volatile  Oil  of  Aristolochia  Reticulata.  {  AmjJu°^\^rm 
the  preparation  of  the  acid  in  sufficient  quantity  to  ascertain  its 
ultimate  composition. 
Alcoholic  Base  of  Fraction  B. — This  was  the  white  crystalline 
camphor-like  body  distilled  from  the  saponified  fraction.  It  was 
recrystallized  from  stronger  ether  until  the  melting  point  was  constant. 
From  this  solvent  it  crystallized  in  transparent  plates,  which  melted 
between  199-5-200°.  It  was  sublimable,  apparently,  without 
decomposition,  condensing  in  feathery  forms  in  stellate  groups.  It 
burnt  with  a  luminous,  sooty  flame,  and  was  soluble  in  alcohol. 
The  crystals  were  submitted  to  combustion ,  the  average  of  two 
closely  agreeing  results  was  : 
Calculated  for  C10H18O. 
Found.  Borneol. 
c,  77-84  77-92 
H,  11-69  11-69 
O,  ......  .  1047  10  39 
Vapor  density  :  Found  5-18  ;  calculated  for  Borneol,  5-33. 
Acid  Radical  of  Fraction  B. — From  the  formula  of  the  ester,  indi- 
cated by  combustion  and  vapor  density,  this  crystalline  acid  would 
have  the  composition  C5H902.  From  the  experiments  it  appears  to 
be  monobasic  and  quite  freely  soluble  in  water. 
Recapitulation. — It  appears  from  the  above  observations  that  this 
oil  consists  of 
(I)  A  terpene,  C10H16,  boiling  at  157°;  of  sp.  gr.  -865  ;  having  a 
strong  affinity  for  bromine  :  characters  which  ally  it  to  the  pinene 
group  of  Wallach's  classification. 
(II)  A  fraction,  boiling  at  2 1 1  °;  of  sp.  gr.  -9849  ;  having  the  com- 
position C15H2502;  and  which  by  saponification  with  potassium 
hydrate  gives  a  camphor-like  body  melting  at  199-5-200°;  having 
the  composition  C10H18O,  and  other  properties  of  borneol ;  and  a 
peculiar  acid  substance.  This  fraction  comprises  about  60  per  cent, 
of  the  oil,  and  it  in  turn  consists  of  about  two-thirds  borneol. 
(III)  A  fraction  boiling  between  239-2400,  of  sp.  gr.  -9888,  having 
the  composition  C18H290 ;  and  being,  apparently,  a  neutral  or  indif- 
ferent substance. 
(IV)  Some  green  or  bluish-green  fluorescent  oil,  in  small  quantity, 
which  readily  decomposes  at  the .  temperature  necessary  for  its 
distillation  under  reduced  pressure. 
