300 
Four  Oak  Barks, 
Am. Jour  Pharm. 
June,  1894. 
involving  the  use  of  lead  acetate,  and  of  sodium  chloride  and  acetic 
ether,  afforded  no  better  success. 
The  tannin  of  Q.  semicarpifolia  was  dissolved  in  a  mixture  of  ether 
and  alcohol,  the  solution  filtered  and  distilled  to  dryness  under 
reduced  pressure,  by  which  means  the  substance  was  rendered  quite 
porous.  After  treating  the  thoroughly  dried  tannin  with  absolute 
ether  to  remove  resin  and  crystalline  substances,  it  was  again  made 
porous  by  dissolving  in  ether  and  alcohol,  and  recovering  the  sol- 
vents under  diminished  pressure.  The  tannin  so  obtained  had  a 
light  reddish-yellow  color  and  was  completely  and  readily  soluble 
in  water. 
One  per  cent,  solutions  of  the  tannin  from  the  different  species 
reacted  as  follows  : 
1  Reagent. 
Quercus 
ann  ulata. 
.Quercus 
dilatata. 
Quercus 
inca?ia. 
Quercus 
semicarpifolia. 
Boiled  with  dilute  sul- 
red  phlo- 
baphene. 
red  phlo- 
baphene 
red  phlo- 
baphene 
red  phlo- 
baphene 
brownish-green 
ppt. 
brownish-green 
ppt. 
green  ppt. 
and  color 
green  ppt. 
and  color 
Bromine  water,  .... 
3'ellow  ppt. 
turning  brown 
yellow  ppt. 
turning  brown 
yellow  ppt. 
turning  brown 
and  black 
yellow  ppt. 
Ferric  chloride  | 
and             f  '  '  * 
Ammon.  hydrate ) 
dark  green 
ppt. 
dark  purple 
ppt. 
brownish-green 
ppt. 
dark  purplish- 
brown  ppt. 
brownish-green 
ppt. 
brown  ppt. 
green  color  and 
ppt. 
purplish-brown 
ppt. 
Ammonio-ferric  sul- 
dark  green 
ppt.,  brownish 
color 
brownish-green 
ppt.  and  color 
bluish-green 
color,  green 
ppt. 
green  color 
and  ppt. 
•  ' 
brownish-3-ellow 
ppt.,  darkening 
brownish-yellow 
ppt.,  becoming 
purple 
brownish-yellow 
ppt.  darkening 
yellowish  ppt. 
turning  pink 
brown  ppt., 
• 
brown  ppt., 
brownish-black 
ppt. 
brownish-vellow 
ppt. 
Sodium  sulphite,  .... 
reddish-brown 
ppt. 
purplish -brown 
ppt. 
brownish-purple 
ppt. 
3-ellow  color 
Stannous  chloride  and 
hydrochloric  acid,  .  . 
slight  reddening 
of  color 
slight  reddening 
of  color. 
.slight  reddening 
of  color 
pink  color 
Pine  wood  and  hydro- 
violet  color 
violet  color 
violet  color 
violet  color 
Potassium  bichromate, 
heavj- 
brown  ppt. 
heavy 
brown  ppt. 
heavy 
brown  ppt. 
heavy 
brown  ppt. 
