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JUICE  OF  SOLANUM  LYCOPERSICUM.  517 
That  portion  of  the  precipitate  by  acetate  of  lead,  insoluble 
in  water,  was,  after  washing  and  drying,  found  to  be  entirely  so- 
luble in  liquor  potassa  and  in  nitric  acid. 
This  precipitate  by  acetate  of  lead,  when  powdered,  and 
heated  in  a  dish,  became  blackened.  On  treating  the  blackish 
mass  with  dilute  acetic  acid,  a  residue  remained,  which,  heated 
on  charcoal,  threw  out  polyhedral  particles. 
Another  portion  of  the  precipitate  by  lead  was  digested  with 
a  solution  of  carbonate  of  ammonia.  The  yellowish  white  fil- 
trate separated  from  the  carbonate  of  lead  did  not  yield,  upon 
the  addition  of  acid  in  excess,  any  gelatinous  mass  of  pectic 
acid. 
The  liquid  separated  from  the  precipitate  by  lead,  yielded 
upon  the  addition  of  the  basic  acetate  of  lead  only  a  slight  yel- 
low colored  precipitate,  which  washed,  decomposed  by  sulphu- 
retted hydrogen,  and  filtered  off  from  the  sulphuret  of  lead, 
gave  an  acid  liquid  producing  no  reaction  with  lime  water  in 
the  cold ;  on  boiling,  a  flocculence  separated,  which  did  not  dis- 
appear on  cooling.  A  part  of  the  acid  liquid  was  evaporated 
to  a  syrup,  and  mixed  with  alcohol,  whereby  white  flocks  of  gum 
were  thrown  down. 
The  liquid  separated  from  the  precipitate  produced  by  the 
basic  acetate  of  lead  was  freed  from  excess  of  lead  by  carbonate 
of  ammonia,  and  the  filtrate  evaporated  to  a  syrupy  consistence. 
A  reddish  brown  mass  of  sweet,  sour,  salty  though  not  bitter, 
taste  is  left,  which  was  almost  entirely  dissolved  in  alcohol. 
A  solution  of  sulphate  of  copper  mixed  with  tartaric  acid,  added 
to  the  filtrate  previously  made  alkaline,  produced  a  considerable 
yellowish  red  precipitate.  Lime  water  made  no  further  change, 
neither  in  the  cold,  nor  on  heating.  Chloride  of  barium  did 
not  affect  it.    Nitrate  of  silver  was  immediately  blackened. 
With  the  remainder  of  the  concentrated  filtrate  a  reaction 
was  attempted  with  lactic  acid,  but  with  negative  results. 
A  portion  of  the  juice  of  the  fruit  was  evaporated  to  a  syrupy 
consistence,  and,  since  nothing  crystallized  from  it,  digested  with 
ether.  The  ethereal  solution  separated  from  the  syrup  was  of 
a  golden  yellow  color  :  it  was  evaporated  to  dryness,  and  the 
mass  treated  with  water.  The  aqueous  solution  left  behind  a 
small  amount  of  resinous  matter  :  filtered  from  this,  it  possessed 
