224  Selenium  Autumnale.  \Aw£™\mT' 
-entirely  tasteless.  It  was  soluble  in  CS2,  less  soluble  in  chloroform, 
insoluble  in  oil  of  turpentine,  benzin  and  HN03.  The  quantity  ob- 
tained, being  very  small,  allowed  of  no  further  experiments. 
The  aqueous  solution  of  the  alcoholic  extract,  which  had  been  con- 
centrated and  set  aside  to  crystallize,  no  crystals  having  been  formed 
in  two  days,  was  subjected  to  the  following  reagents :  NH4HO,  KHO 
and  Na2C03  deepened  the  color  of  the  liquid,  producing  no  further 
•change.  CaCl2  produced  a  copious  yellowish  white  precipitate,  solu- 
ble in  HC2H302,  rendering  the  presence  of  H3P04  probable.  Fe2Clg 
produced  a  black  coloration  and  a  slight  black  precipitate ;  the  black 
eolor  did  not  disappear  on  the  application  of  heat.  Gelatin  produced 
a  turbidity,  thereby  confirming  the  presence  of  tannic  acid,  although 
in  a  small  proportion,  as  no  astringency  was  perceptible  in  the  plant, 
nor  in  any  of  the  extracts  thus  far  obtained  from  it.  Pb2C2H302 
produced  a  dense  precipitate,  entirely  soluble  in  HC2H302,  thereby 
proving  the  absence  of  H3P04,  the  presence  of  which  had  been  ren- 
dered probable  by  the  precipitate,  soluble  in  HC2H302,  which  had 
been  obtained  on  the  addition  of  CaCl2  to  the  solution. 
On  application  of  Trommer's  tet,t  for  glucose,  a  precipitate  of  Cu20 
was  formed.  To  convince  myself  in  another  manner  of  the  presence 
of  glucose,  a  decoction  was  made  from  a  small  quantity  of  the  herb, 
the  decoction  treated  with  Pb2C2H302,  the  resulting  lead  compounds 
separated  from  the  liquid  by  filtering,  the  excess  of  lead  removed  from 
the  filtrate  by  H2S  and  filtering,  the  excess  of  H2S  expelled  by  boiling 
and  filtering ;  the  resulting  clear  yellow  filtrate  was  evaporated  to  a 
syrupy  liquid,  which  had  a  decidedly  sweet  taste,  and  on  further  evap- 
oration and  heating  it  gave  off  the  peculiar  odor  and  possessed  the 
taste  of  caramel. 
The  remainder  of  the  aqueous  solution  of  the  alcoholic  extract  was 
then  treated  with  Pb2C2H302,  the  precipitate  collected  on  a  filter  and 
washed ;  the  filtrate  and  washings  were  neutralized  with  NH4HO, 
whereby  only  a  very  slight  turbidity  was  produced. 
The  Pb2C2H302  precipitate  was  treated  with  boiling  water  and  fil- 
tered, the  filtrate  concentrated  to  a  small  bulk,  and  allowed  to  stand 
in  a  cool  place  to  crystallize.  After  standing  twenty-four  hours,  a 
small  quantity  of  crystals  of  malate  of  lead  were  obtained. 
The  portion  of  the  Pb2C2H302  precipitate,  insoluble  in  boiling 
water,  was  dissolved  in  dilute  HC2H302,  then  neutralized  with  NH4HO, 
whereby  a  precipitate  was  formed,  which  was  washed,  suspended  in 
