2 
Am.  .luiir.  I'liKiiii. 
.Ill  11.,  1H,S-J. 
L\.  Estimation  of  Benzol  ExTijAcrr. — One  Imndred  grain.s  of 
the  powdered  l)ark  were  exhau.sted  with  ])iire  ben/ol,  and  the  percohite 
evaporated  until  it  ceased  to  lose  weight.  The  amount  of  extract  thus 
obtained  was  8'75  orams  or  (S-75  per  cent)  and  it  was  of  a  yellowisli- 
brown  color. 
This  extract  was  treated  with  distilled  water  and  with  very  dilute 
hydrochloric  acid  ;  the  solutions  examined  for  alkaloids  and  glucosides 
gave  negative  results.  93  per  cent,  alcohol  took  up  5*6  per  cent,  of 
the  extract.  Upon  evaporation,  there  remained  a  resinous  body  hav- 
ing a  yellowish-brown  color  and  the  odor  of  the  drug. 
An  alcoholic  solution  of  this  extract  gave  a  precipitate  with  an  alco- 
holic solution  of  acetate  of  lead.  The  precipitate  was  collected, 
washed  with  alcohol  and  freed  from  lead  by  H2S.  Upon  evaporation 
there  remained  a  browai  amorphous  mass,  soluble  in  amnionic  hydrate 
with  the  ])roduction  of  a  deeper  color.  From  this  solution  it  was 
precipitated  by  an  acid,  showing  it  to  be  an  acid  resin  insoluble  in 
water.  Its  alcoholic  solution,  with  ferric  chloride,  gave  a  deep  green- 
brown  coloration.  An  infusion  of  the  bark  did  not  precipitate  gela- 
tin from  its  solution,  which  would  indicate  the  absence  of  tainiin. 
The  filtrate  from  the  lead  precipitate  was  then  treated  with  an  alco- 
holic solution  of  sub-acetate  of  lead,  which  caused  a  precipitate;  after 
washing  and  freeing  this  precipitate  from  lead,  the  alcoholic  solution 
was  evaporated,  leaving  a  red-brownish-yellow,  amorphous  and  tena- 
cious mass,  sparingly  soluble  in  water.  Its  alcoholic  solution,  with 
ferric  chloride,  gives  a  green  color  due  to  the  acid  resin  not  precipitated 
;by  the  neutral  acetate  of  lead. 
The  resin  in  solution,  not  precipitated  by  neutral  or  oxy-  acetate  of 
lead,  was  freed  from  lead  and  evaporated,  which  left  a  soft,  brownish- 
yellow  mass  having  the  odor  of  the  drug  and,  at  first,  a  bland  taste, 
but  soon  became  cpiite  acrid.  It  is  soluble  in  alcohol,  ether,  benzol, 
chloroform,  carbon  disulphide  and  sparingly  in  distilled  water.  This 
is  a  neutral  resin. 
The  soft,  resinous  matter  which  remains  undissolved  after  treatment 
of  benzol  extract  with  alcohol,  as  above,  is  of  a  greenish-brown  color, 
inodorous,  soluble  in  chloroform,  bisulphide  of  carbon  and  partly  in 
ether.  The  substance  which  remains  after  treatment  with  ether  is  a 
caoutchouc-like  body,  very  tenacious  and  elastic,  not  affected  by  strong 
acids  or  alkalies,  is  soluble  in  bisulphide  of  carbon  and  chloroform. 
V.  Examination  of  Alchoi.ic  Extract. — The  i)owder  not  dis- 
