igo  Coca  Leaves.  {AmiSS'f^r m' 
colorless  needles  ;  the  corresponding  methochloride  is  a  crystalline 
substance,  readily  soluble  in  water  and  alcohol,  but  insoluble  in 
ether. 
The  molecular  formula  of  liomococaic  acidy  determined  in  glacial 
acetic  acid  solution,  was  found  to  be  C9H302.  This  acid  melts  at 
150°,  and  dissolves  freely  in  alcohol,  ether,  chloroform,  glacial  acetic 
acid,  and  hot  water,  but  is  only  sparingly  soluble  in  light  petroleum 
and  cold  water ;  it  is  only  slowly  oxidized  by  a  warm  solution  of 
potassium  permanganate.  A  number  of  its  salts  were  prepared  and 
analyzed,  but  they  are  all  amorphous,  ill-characterized  compounds. 
The  ^z/r^-derivative,  C9H702  N02,  prepared  by  warming  the  acid 
with  nitric  acid  of  sp.  gr.  152,  crystallizes  from  dilute  acetic  acid  in 
yellowish  needles,  melts  at  2260,  and  is  readily  soluble  in  alcohol 
and  glacial  acetic  acid,  but  more  sparingly  in  chloroform,  ether  and 
boiling  water. 
ft-Cocdic  acid,  C1SH1604,  is  formed  when  homococaic  acid  is  heated 
for  a  long  time  with  concentrated  hydrochloric  acid,  or  fused  with 
potash  ;  it  crystallizes  from  boiling  water  in  long,  colorless  needles, 
melts  at  1890,  and  is  readily  soluble  in  glacial  acetic  acid,  alcohol 
and  chloroform,  but  more  sparingly  in  benzene,  and  almost  insoluble 
in  light  petroleum  ;  its  molecular  weight  was  determined  in  glacial 
acetic  acid  solution,  with  results  in  accordance  with  the  molecular 
formula  given  above.  It  is  only  very  slightly  acted  on  by  potassium 
permanganate.  The  potassium  salt  crystallizes  in  lustrous  prisms, 
and  is  readily  soluble  in  cold  water.  The  copper  salt,  C18Hu04Cu 
-f-  2H20,  is  a  green,  crystalline  compound,  and  loses  its  water  at 
1600,  becoming  dark-blue.  The  silver  salt,  ClsHuO^Ag2,  is  stable 
in  the  light.  The  methyl  salt,  ClsHu04Me2,  is  a  mobile  oil.  The 
dinitr  o-derivditive,  C^H^O^NO^,  prepared  by  treating  the  acid 
with  concentrated  nitric  acid,  crystallizes  from  glacial  acetic  acid  in 
pale  yellow  prisms,  melts  at  2520,  and  is  readily  soluble  in  alcohol, 
chloroform,  glacial  acetic  acid  and  ether,  but  more  sparingly  in 
water. 
/3-Isococaic  acid  or  o-truxillic  acid  (compare  Liebermann,  Berichte, 
1889,  2249),  prepared  from  isococaic  acid  in  like  manner,  has  the 
molecular  formula  C18H1604 ;  it  melts  at  1720,  not  at  1740,  as  stated 
by  Liebermann.  The  barium  salt,  ClsHu04Ba  -f  4H0O,  crystallizes 
in  short,  lustrous  prisms  ;  the  copper  salt  crystallizes  with  2  mols. 
H20.     The   dinitr  0-deriva.tive,  C18Hu04(N02)2,   crystallizes  from 
