EXAMINATION  OF  KINO. 
545 
c 
11 
43.65 
43.71 
H 
5 
3.31 
3.31 
0 
10 
53.04 
52.98 
Basic  acetate  of  lead  is  better  suited  to  the  separation  of  this 
red  coloring  matter  than  neutral  acetate ;  however,  the  lead  com- 
pound prepared  with  the  former,  is  not  one  with  an  excess  of  base, 
but  shows  that  the  above  empirical  formula  must  be  multiplied  by 
5: 
c 
55 
38.08 
II 
25 
2.88 
0 
50 
46.16 
PbO  - 
1 
12.88 
Hennig  calls  this  substance  kinoic  acid. 
The  third  substance  contained  in  African  kino  is  very  difficult  to 
obtain  colorless  and  free  from  the  above  acid.  Hennig  endeavored 
to  prepare  it  by  digesting  the  already  mentioned  spontaneous  de- 
posit from  the  aqueous  infusion  with  successive  quantities  of  water 
until  it  was  no  longer  colored  upon  standing,  and  gave  no  reaction 
with  perchloride  of  iron,  then  extracting  it  with  strong  alcohol, 
saturating  the  tincture  with  neutral  acetate  of  lead  and  drying  the 
precipitate,  collected  on  a  filter,  under  the  air-pump.  Analysis 
gave  25.29  per  cent,  oxide  of  lead  and 
c 
29 
41.74 
41.74 
H 
22 
4.99 
473 
0 
25 
53.27 
53.53 
corresponding  closely  with  the  formula  of  Jahn's  pectic  acid.  This 
substance  appears  to  be  more  prone  to  alteration  by  external  in- 
fluences than  the  former,  and  passes  finally  into  ulmic  acid,  which 
partly  constitutes  the  residue  left  on  the  extraction  of  kino  by 
water  or  alcohol. 
The  quantitative  relations  of  the  several  constituents  of  kino  may 
be  represented  in  the  following  order  : 
Kinoic  acid, 
Tannic  acid  and  a  trace  of  gallic  acid, 
Pectin, 
Ulmic  acid, 
Inorganic  salts  with  an  excess  of  earthy  bases. 
Bischoff  and  Mohr  have  already  put  forward  the  opinion  that 
the  astringent  substance  in  kino  is  identical  with  ordinary  tannic 
36 
