262  Volatile  Oil  of  Aristolochia  Reticulata.  {Am-j™I;wi&TI1~° 
a  taste  similar  to  those  of  the  oil,  and  a  neutral  reaction.  Sp.  gr. 
at  15-5°,  -9849. 
The  average  of  five  closely  agreeing  combustions  was  : 
Found.  Calculated  for  C15H05O0. 
c,  75-94  75-95 
H,  10-64  1055 
O,  13-42  1-3-50 
ioo-oo  ioo-oo 
Vapor  density  :    Found  8-28,  8-27;  calculated  for  C15H2502,  8-20. 
Fraction  C. — Boiling  point  in  air  239-2400,  barom.  pressure  762-1 
mm.  This  was  a  yellowish  green  liquid,  of  a  buchu-like  odor; 
warm,  mildly  camphoraceous  taste;  and  a  neutral  reaction.  Sp.gr. 
at  15-5°,  -9888. 
The  average  of  three  closely  agreeing  combustions  was  : 
Found.  Calculated  for  C18H290 
C,  82-69  8276 
H,  11*07  ii-ii 
O,   6-24  6-13 
ioo-oo  I00'00 
Vapor  density:    Found  8-89  ;  calculated  for  C18H290,  9-04. 
Fractio7i  D. — This  consisted  of  the  green  and  bluish-green  fluor- 
escent oils,  but,  as  they  were  easily  converted  into  the  resinous 
decomposition  compounds  always  obtained  in  the  distillation  of  this 
oil,  it  was  not  found  possible  to  separate  them  by  means  of  distilla- 
tion, in  a  state  of  purity  essential  for  ultimate  analysis,  nor  could 
they  be  obtained  in  this  condition  by  collecting  the  oil  of  the  fourth 
litre  of  distillate  and  distilling  it.  In  the  several  lots  so  treated 
only  a  very  small  amount  of  distillate  from  each  was  obtained  above 
the  boiling  point  of  fraction  C,  and  these  varied  in  color,  reaction 
to  litmus,  and  to  reagents — all,  however,  were  empyreumatic,  cam- 
phoraceous and  specifically  lighter  than  water. 
Saponification  of  Fraction  B. — The  formula  of  this  fraction  sug- 
gesting it  to  be  an  ester,  the  action  of  alkali  was  tried  upon  it.  For 
this  purpose  a  portion  of  the  fraction  was  heated  with  half  its  weight 
of  potassium  hydrate,  in  aqueous  solution,  in  a  flask  attached  to  an 
upright  condenser,  on  a  water-bath  at  the  boiling  point  for  about  two 
hours,  frequently  shaking  the  mixture.  The  contents  of  the  flask, 
which  consisted  of  two  layers,  were  now  diluted  with  water,  and  the 
mixture  distilled,  when  a  distillate  was  obtained  in  which  was  a 
