Am.  Jour.  Pharm.l 
May,  1883.  / 
Examination  of  Cheken  Leaves. 
25a 
A  CHEMICAL  AND  MICROSCOPICAL  EXAMINATION 
OF  CHEKEN  LEAVES. 
By  Jno.  Hoehn.* 
Summary  of  results  :  ^ 
Per  cent, 
of  drug. 
Moisture,  .  .  .  .  .  .  .  9*48 
Total  ash,    .  .  .  .  .  .  .  9*48 
Sol.  in  H2O  :  KCl,  K2SO4      .....  '68 
Insol.  in  H2O,  sol.  in  HCl :  Bases,  Mg,  Ca,  Al ;  Acids,  H3PO4, 
H2CO3      .  .  .  .  .  .  .  5.61 
Insol.  in  HgO,  HCl ;  sol.  in  NaOH  :  combined  silica,  .  2-45. 
Insol.  in  H2O,  HCl  and  NaOH  :  sand  and  clay,  .  .  '73 
Estimation  of  benzol  extract. 
Total  benzol  extract,  .....  8*74 
Volatile  oil,  .            .            .            .            .  .3-7 
Sol.  in  H2O,       .  .            .            .            .            .  -5 
Organic  matter,  .            .            .            .            .            .  -35 
Ash,           .            .  .            .            ,            .            .  -14 
Had  negative  results  for  organic  acids  and  alkaloidal  reagents,, 
except  phosphomolybdic  acid,  which  gave  a  light  green  coloration,  but 
on  the  addition  of  ammonia  turned  a  darker  green,  followed  by  a  prec^ 
coming  down  rapidly  on  the  application  of  heat.  But  got  a  test  for 
glucoside  as  follows :  By  heating  the  solution  with  a  few  drops  of 
H2SO4  for  10  minutes,  neutralizing  with  NaOH,  then  adding  Feh- 
ling's  solution  and  heating  5  minutes,  the  cupric  salt  being  then 
reduced  to  CugO. 
Per  cent, 
of  drug. 
Insol.  in  H2O ;  sol.  in  HCl,    .  .  .  .  .  -45 
The  same  results  as  in  the  H2O  sol. 
Insol.  in  HjO,  HCl ;  sol.  in  80  per  cent,  alcohol :  chlorophyll 
and  resins,  ......  2*08 
Insol.  in  H2O,  HCl  and  80  per  cent,  alcohol :  wax  and  fixed  oils,  1- 
Estimation  of  alcohol  extract. 
Total  alcohol  extract,     .  .  .  .  . 
Powder  separated  on  cooling,  . 
Ash  from  extract,     .  . 
Organic  matter  insol.  in  H2O, 
22-86: 
2-96 
2-47 
1-02 
7-25 
Organic  matter  and  ash  soluble  in  water,   .  .  .  11*63 
^  An  abstract  from  Graduation  thesis.  University  of  Michigan. 
In  this  work  I  followed  Mr.  H.  B.  Parson's  scheme  for  Plant  Analysis^ 
as  being  more  simple  than  that  by  Wittstein  and  Rochleder.    See  "  Amer. 
Jour.  Phar.,"  April,  1880,  p.  210. 
