Am.  Jour.  Pharm.  "I 
May,  1881.  J 
Rhus  Aromaticd. 
215 
B.  Insoluble  in  absolute  alcohol. 
c.  Soluble  in  imter. 
c\  Precipitate  by  subacetate  of  lead. — Coloring  matter  only. 
c^.  Filtrate  from  precipitate  by  subacetate  of  lead. — The  excess  of 
lead  was  precipitated  by  hydrosulphuric  acid,  the  filtrate  boiled,  divided 
into  three  portions,  two  of  which  were  tested  for  alkaloids  and  gluco- 
sides  with  negative  results.  The  third  portion  was  evaporated  to  dry- 
ness. A  crystalline  substance  of  an  amber  color  remained,  which, 
upon  analyzing  proved  to  be  sodium  and  potassium  salts  together  with 
a  little  organic  matter. 
d.  Insoluble  in  icater. 
d^.  Soluble  in  dilute  sulphuric  acid. — Coloring  matter  only. 
d^.  Insoluble  in  dilute  sulphuric  acid. — A  small  amount  of  "  extrac- 
tives" and  color  substances  remained. 
The  drug  previously  exhausted  with  benzol  and  alcohol  was 
exhausted  with  distilled  water.  An  aliquot  part  of  the  aqueous  solu- 
tion was  evaporated  to  dryness  and  the  per  cent,  extracted  by  water 
estimated,  which  amounted  to  4*85.  The  reserved  solution  yielded, 
with  alcohol,  a  gummy  precipitate  which,  with  amnionic  oxalate,  was 
found  to  contain  calcium.  Coloring  matter  was  also  extracted  by 
water. 
The  drug  remaining  after  the  above  treatment  was  free  from  odor 
and  taste,  so  it  was  not  thought  necessary  to  carry  the  analysis  further. 
A  decoction  of  the  fresh  bark  gave  a  blue  reaction  with  solution  of 
iodine  in  potassic  iodide,  indicating  the  presence  of  starch.  The 
absence  of  starch  granules  in  the  microscopical  sections  is  due  to  the 
fact  that  the  bark  from  which  they  were  made  was  previously  repeat- 
edly boiled  with  water  to  clear  the  tissues. 
The  bark  treated  with  solution  of  potassic  carbonate  (to  extract  the 
organic  acids)  yielded  an  extract  containing  an  oxalate,  but  free  from 
malates  and  tartrates. 
The  fresh  bark,  when  distilled  with  water,  yielded  a  volatile  oil, 
which,  when  first  distilled  has  a  disgusting  odor  resembling  very  much 
the  odor  of  bed-bugs,  but  when  the  distillate  is  treated  with  ether,  the 
ethereal  solution  allowed  to  evaporate,  the  oil  remaining  left  in  con- 
tact with  the  air  for  twenty-four  hours,  it  acquires  a  pleasant  odor,  dis- 
tinct in  itself. 
