460  Examination  of  Lippia  Scaberrima.  {^£^ixfvm!*' 
The  chloroformic  liquid,  after  having  been  shaken  with  a  solution 
of  sodium  carbonate,  was  treated  with  potassium  hydroxide  solu- 
tion, and  this  caused  the  separation  of  a  tarry  potassium  compound, 
but  nothing  crystalline  could  be  obtained  fro  n  it. 
IV.  Ethyl  Acetate  Extract  of  the  Resins. 
This  was  very  small  in  amount,  but  afforded  a  minute  quantity 
of  a  crystalline  substance  which  melted  at  1230  C. 
V.  Alcohol  Extract  of  the  Resins. 
This  was  a  black  resin,  and  amounted  to  25  grammes.  Nothing 
crystalline  could  be  obtained  from  it. 
Examination  of  the  Aqueous  Liquid  [B). 
The  dark-colored,  aqueous  liquid  which  had  been  decanted  from 
the  cake  of  resins,  as  previously  described,  was  extracted  ten  times 
with  ether,  and  the  yellow,  ethereal  liquid  shaken  with  a  solution  of 
sodium  carbonate.  The  alkaline  liquid  thus  obtained  was  acidified 
with  sulphuric  acid,  when  a  yellow  solid  was  precipitated.  This 
was  collected  on  a  filter,  and  crystallized  from  alcohol,  when  it  was 
obtained  in  the  form  of  yellow  needles,  possessing  a  silky  lustre. 
This  substance  melted  and  decomposed  at  about  2670  C,  and  on 
analysis  afforded  the  following  results : 
00756  gave  0-1570  C02  and  0-0344  H20.  C  =  56  6;  H  =  5-0. 
00803    "    0-1655  C03   "    0-0362  H20.     C  ==  564;  H  —  5-0. 
The  percentage  composition  of  this  substance  agrees  within  the 
limits  of  experimental  error  with  that  required  for  several  possible 
empirical  formulae,  but,  as  less  than  0-3  gramme  of  the  substance 
was  obtained,  it  is  impossible  to  decide  which  of  these  formulae 
should  be  assigned  to  it.  The  substance  does  not  contain  nitrogen, 
and,  so  far  as  could  be  ascertained,  it  is  not  identical  with  any  sub- 
stance heretofore  described.  The  ethereal  liquid  from  which  this 
substance  had  been  removed  by  shaking  with  a  solution  of  sodium 
carbonate  only  contained  a  small  quantity  of  green  resinous  matter. 
The  aqueous  liquid,  which  had  been  extracted  with  ether,  was 
then  treated  with  a  slight  excess  of  basic  lead  acetate,  and  the 
copious  yellow  precipitate  collected  on  a  filter.  A  portion  of  this 
precipitate  was  suspended  in  water  and  decomposed  with  hydrogen 
