^"April'iSr"''}        Alkaloids  from  Remijia  Purdieana. 
Concentrated  sulphuric  acid  dissolves  concusconine  with  bluish  green 
color,  becoming  olive-green  on  heating.  With  chromic  acid  and  sul- 
phuric acid,  it  gives  a  coloration  at  first  dark  reddish  brown,  then  intensely 
dark  green.  Although  concusconine  is  tasteless,  its  solutions  in  acids 
have  a  bitter  taste.  The  salts  are  as  a  rule  gelatinous.  The  platino- 
chloride  (C23H26N204)2,H2PtClg  +  ^HgO,  is  obtained  as  a  voluminous 
yellow  flocculent  precipitate.  The  normal  sulphate,  (C23H26N204)2,H2S04, 
forms  small  white  prisms  nearly  insoluble  in  water  and  alcohol  in  the 
cold,  sparingly  soluble  on  heating.  The  aM  sulphate  is  a  gelatinous 
mass  readily  soluble  in  hot  Avater.  By  mixing  an  alcoholic  solution 
with  methyl  iodide,  and  allowing  it  to  stand  24  hours,  there  is  obtained 
a  mixture  of  two  iodides  in  about  equal  quantities ;  they  can  be  separated 
by  the  difference  of  their  solubilities  in  hot  alcohol.  The  less  soluble 
^/-compound  forms  microscopic  hexagonal  prisms  of  the  formula 
C23H26N204,MeI,  very  sparingly  soluble  in  hot  alcohol,  moderately 
soluble  in  boiling  water.  By  treatment  with  silver  chloride  it  is  con- 
verted into  the  chloride,  C23H26N204,MeCl,  crystallizing  in  microscopic 
needles,  readily  soluble  in  water  and  alcohol.  The  platinochloride 
(C23H26MeN204Cl),2PtCl^  -\-  mfi,  forms  a  yellowish  red  flocculent 
precipitate,  and  is  insoluble  in  water.  The  aurochloride  forms  a  dirty 
yellow  flocculent  precipitate,  from  which  gold  soon  separates.  The 
sulphate  (C23H2gMeN204)2S04,  formed  by  the  action  of  silver  sulphate 
on  the  iodide,  is  amorphous  and  very  readily  soluble  in  water  and 
alcohol.  Its  rotary  power  in  aqueous  solution  at  p.  —  3*764  and  t. 
=  15°  is  -+  73°.  The  hydroxide,  C23H26N204Me.OH  -[-  5H2O, 
obtained  by  the  action  of  baryta-water  on  the  sulphate,  crystallizes  in 
colorless  cubes,  melts  at  202°,  is  readily  soluble  in  alcohol  and  boiling 
water,  insoluble  in  ether.  The  iodide  of  the  f-i-compound,  C23H26N2O4 
Mel,  is  gelatinous  and  dries  in  air  to  a  horny  mass;  is  somewhat  soluble 
in  boiling  water,  readily  soluble  in  alcohol.  The  chloride  is  amorphous. 
The  platinochloride  (C23H'26N204MeCl)2,PtCl4  +  5H2O,  is  a  reddish 
yellow  flocculent  precipitate.  The  sidphate,  (023^26^2^4^^)2804,  is  a 
brown  amorphous  mass,  and  has  no  action  on  polarized  light.  The 
hydroxide,  023H2gN2O4Me.OH  +  2JH2O,  forms  a  l)rown  amorphous 
mass,  readily  soluble  in  cold  water  and  alcohol. 
Chairamine,  O22H26N2O4  H2O,  crystallizes  in  white  needles  or 
thick  colorless  prisms,  and  melts  at  140°,  or  when  anhydrous,  at  233. 
It  is  readily  soluble  in  ether  and  chloroform,  1  part  of  the  base  dis- 
solves in  540  ])arts  of  97  per  cent,  alcohol.    The  alcoholic  solution  is 
