406 
OLEUM  CHENOPODII  ANTHELMINTIC!. 
A  portion  of  the  oil  was  distilled  with  water  ;  the  product  of  the 
distillation  was  collected  in  ten  different  portions,  according  to 
the  different  periods  of  the  process.  The  first  two,  or  those  por- 
tions obtained  in  the  earlier  periods  of  the  process,  were  distilled 
in  the  same  manner  as  before.  The  first  products  of  this  re-dis- 
tillation were  collected  and  freed  from  the  water,  by  mixing  and 
digesting  them  for  several  days  with  fresh  prepared  chloride  of 
calcium.  As  obtained  by  this  process,  this  oil  was  perfectly 
colorless,  burned  with  a  strong  smoky  flame,  and  had  a  specific 
gravity  by  16°  Cent,  of  0-932.  Its  boiling  point  was  found  to 
be  near  176°  Cent. 
A  few  pieces  of  potassium,  still  slightly  tarnished  upon  being 
dropped  into  the  oil,  assumed  the  clear  metallic  lustre  of  the 
pure  metal.  A  portion  of  this  oil  was  now  for  the  third  time 
distilled  in  the  presence  of  potassium,  the  product  being  used 
for  the  elementary  analysis.  The  result  of  this  is  as  follows  : 
Quantity  of  material  taken  =0-369  gramme  gave 
Water  0-386 
Carbonic  acid  .    .    .  1*192 
Hence  the  pro  cent,  composition 
Carbon    .    .    88.073  20  88.24 
Hydrogen    .    11-758  16  11-76 
Action  of  hydrochloric  acid  gas. 
A  stream  of  hydrochloric  acid  gas  was  passed  through  a  quan- 
tity of  the  oil  obtained  by  the  above  method,  the  effect  of  which 
was  to  change  it  gradually  to  a  dark  red  color,  attended  with  a 
considerable  degree  of  heat,  and  the  separation  of  a  dark  colored 
resin.  The  excess  of  acid  was  now  neutralized  with  fresh  burnt 
carbonate  of  magnesia  and  the  whole  distilled  with  water.  The 
distillate  was  of  a  light  yellow  color,  burning  with  a  smoky  flame 
having  the  edges  tinged  with  green. 
This  product  was  again  submitted  to  the  action  of  dry  hydro- 
chloric acid  gas,  till  at  last  nearly  the  entire  quantity  changed 
into  a  light  red  colored  crystalline  mass.  This  was  then  dried 
by  pressing  between  blotting  paper  and  redissolved  in  alcohol, 
from  which  it  crystallized  on  cooling  in  white  prisms,  having  the 
odor  of  common  camphor  and  an  aromatic  taste. 
This  was  obtained  pure  by  sublimation.    It  is  insoluble  in 
