336 
Investigation  of  the  Tannins. 
A.m.  Jour.  Pharm. 
July,  1900. 
Part. 
Date  of 
Collection. 
Moisture. 
Ash  in 
Absolutely 
Dry  Bark. 
Tannin  in 
Absolutely 
Dry  Bark. 
Remarks. 
Root  bark  .  . 
June  23 
67-07 
8-86 
774 
July  9 
53*42 
8-99 
11-27 
Aug.  16 
3974 
6*07 
8*56 
Leaves  turning  in  color. 
Sept.  16 
11  '53 
6'97 
7-41 
f  Color  of  leaves  not  completely 
\  turned. 
Oct.  16 
"  28 
49'56 
21-92 
9-69 
io-ii 
1-86 
r46 
f  Leaves  completely  turned  in 
\  color. 
Whole  bark  \ 
of  stem  .  j 
June  7 
32-84 
3'3° 
4*39 
Inner  bark } 
of  stem  .  J 
July  9 
3 1 '95 
5 '55 
10-72 
Inner  bark] 
of  stem  .  j 
Aug.  16 
42'75 
5  57 
11-78 
Leaves  are  turning  in  color. 
Inner  bark  1 
of  stem  .  j 
Sept.  16 
9'97 
5'22 
J  Leaves  are   not  completely 
X    turned  in  color. 
Inner  bark) 
of  stem  .  j 
Oct.  16 
3i'53 
6-47 
382 
f  Leaves  are  completely  turned 
X    in  color. 
Wood  .... 
June  7 
1211 
0*64 
I-30 
Leaves    .  .  . 
7 
58-22 
4'54 
22-49 
"  ... 
July  9 
56'36 
7'58 
28-64 
Bushes  not  blooming  this  year. 
".,    "  ' 
"  9 
53'8i 
7  05 
24'35 
Bushes  blooming  this  year. 
Aug.  16 
32-97 
9 '45 
22*15 
Turning  color. 
Sept.  16 
8-47 
7  09 
17-41 
(Not   completely   turned  in 
X  color. 
Oct.  16 
IO-I2 
8-41 
22-91 
Completely  turned  in  color. 
Stem  of  ) 
Leaves    .  ) 
June  7 
53'i7 
4-48 
2 '34 
Fruit  .... 
j  July  13 
26-68 
3'32 
12-13 
Quite  hair}'. 
1    Aug.  16 
11-17 
3'42 
14-41 
Fully  developed. 
Sept.  16 
8-92 
379 
9-88 
f  Leaves  not  completely  turned 
X    in  color. 
The  tannin  was  isolated  from  some  of  the  leaves  and  stem  bark. 
It  showed  the  following  composition : 
Gallotannic 
Leaves.         Stem  Bark.  Acid. 
Carbon  52*08  51-86  52*17 
Hydrogen  3-89  3-87  3*10 
Oxygen  44 '03  44*27  44  73 
Rhus  Glabra. — The  materials  for  the  following  estimations  were 
collected  in  1894,  at  which  time  the  estimations  were  made. 
