ON  MAGNOLIA  GLAUCA. 
31 
of  water,  until  everything  soluble  in  that  menstruum  was  re- 
moved, leaving  a  tough  tenacious  mass  of  the  appearance  of 
putty.  This  was  soluble  in  ether  and  alcohol,  but  insoluble  in 
water.  It  was  dissolved  in  alcohol  and  thrown  on  a  filter.  Be- 
fore the  liquid  passed,  the  filter  was  lined  with  colorless  trans- 
parent, very  fragile  crystals,  which  crack  under  the  teeth,  and 
when  freed  from  adhering  resinous  matter  have  little  taste  or 
odor.  The  liquid  which  passed  the  filter,  when  evaporated 
spontaneously,  afforded  a  greyish  brown  resinous  extract,  having 
the  odor  and  taste  of  the  bark  in  a  high  degree. 
A  tincture  of  the  bark  made  with  diluted  alcohol  is  less  pun- 
gent than  that  with  strong  alcohol. 
An  acetic  tincture  was  aromatic  and  very  bitter  and  pungent. 
An  ethereal  tincture,  by  evaporation,  afforded  no  crystals,  but 
consisted  of  resin,  odorous  matter,  and  fixed  oil,  which  caused 
it  to  stain  paper  like  oil.  A  small  portion  of  aqueous  liquid, 
strongly  reddening  litmus,  remained  after  the  ether  had 
evaporated,  the  nature  of  which  was  not  determined. 
Bark  of  the  trunk. — When  an  alcoholic  tincture  of  this  bark 
is  allowed  to  evaporate  spontaneously,  a  reddish  brown  extract 
is  obtained,  possessed  of  a  bitter  taste,  and  the  odor  of  the 
bark  but  has  very  little  pungency.  It  did  not  afford  a  crystalline 
matter  as  did  the  extract  of  the  bark  of  the  root,  when  treated 
by  liquor  potassse,  &c,  the  latter  dissolving  it  and  precipitating 
it  on  the  addition  of  sulphuric  acid.  When  this  matter  was 
dried  and  redissolved  and  evaporated,  no  evidence  of  crystals 
was  obtained.  Other  processes  were  tried  to  isolate  a  crystalline 
matter  like  that  in  the  root,  but  they  all  failed. 
A  decoction  of  the  bark  affords  a  dark  green  precipitate  with 
sesquichloride  of  iron  indicative  of  some  analogue  of  tannin. 
The  leaves,  also,  when  treated,  did  not  yield  the  crystalline 
principle,  but  afforded  a  bitter  extract,  volatile  oil  and  an  un- 
determined acid. 
The  fruit. — The  medicinal  virtues  of  the  Magnolia  glauca 
appear  to  be  concentrated  in  the  fruit.  The  alcoholic  tincture 
is  very  pungent  and  bitter,  and  of  a  light  red  color.  By 
evaporation  it  yields  a  black,  resinous,  soft  extract,  associated 
with  a  thick  liquid  which  is  exceedingly  pungent  and  acrid, 
affecting  the  throat  when  tasted,  and  creating  a  sense  of  nausea. 
