200 
ON  NITROBENZOLE. 
oxalate  of  potassa,  KO,  2  (C2  03)  -f  3HO;  from  the  quince  malic 
acid,  M,  HO,  and  from  the  tomato,  acid  malate  of  lime  in  con- 
nection with  acid  citrate  of  potassa. 
The  relative  proportions  are  as  follows  :  one  pound  of  rhubarb 
stems  yielded  13  ounces  of  juice,  which  produced  crystals  of  bin- 
oxalate  of  potassa  to  the  amount  of  70  grains.  The  same 
amount  of  quinces,  (one  pound,)  which  produced  25  grains  of 
crystals  of  malic  acid.  The  tomato,  one  pound,  yielded  11 
ounces  of  juice,  which  produced  10  grains  of  crystallized  acid 
malate  of  lime,  besides  an  unascertained  amount  of  acid  citrate 
of  potassa. 
I  am  sorry  to  say  that  the  season  had  by  this  time  so  far  ad- 
vanced as  to  not  allow  time  to  investigate  some  of  our  other  im- 
portant vegetable  acid  juices,  which  I  had  at  first  in  view,  and 
which  are  of  deep  interest  to  the  history  of  organic  substances  ; 
but  should  time  afford  me  another  opportunity,  a  further  consid- 
eration of  these  important  juices  may  be  expected  hereafter.  In 
offering  this  chemical  investigation  as  a  small  contribution  to  the 
list  of  our  chemical  analysis  of  organic  substances,  I  cannot  but 
indulge  the  hope  that  my  endeavors  have  not  been  altogether 
ineffectual,  though  the  results  frequently  baffled  me  ;  but  that 
the  object  at  which  I  first  aimed  has  at  length  been  in  part,  if 
not  wholly,  obtained  so  far  as  the  juices  above  mentioned  are 
concerned. 
Philadelphia,  11th  mo.  1st,  1858. 
ON  NITROBENZOLE. 
By  Dr.  F.  Mahla,  of  Chicago. 
The  article,  which  is  at  present  so  much  used  for  perfumery- 
purposes,  known  under  the  general  name  of  nitrobenzole,  is  not, 
as  it  is  generally  supposed,  the  nitro-combination  of  the  benzole 
alone.  The  following  will  show  that  the  article  which  is  sold 
in  commerce  and  represented  to  be  nitrobenzole  is  a  mixture  of 
different  substances. 
Some  time  ago  I  got  from  a  drug-house  of  Baltimore  a  bitter 
almond  oil,  which  I  supposed  to  be  adulterated  with  the  artifi- 
cial bitter  almond  oil,  because  its  color  was  rather  dark  yellow 
