338 
Investigation  of  the  Tannins. 
Am.  Jour.  Pharm. 
July,  1900. 
produced  by  Pemphigus  rhois,  Fitch.  It  "  is  one  of  the  plant-louse 
galls." 
The  tannin  was  isolated  from  some  of  these  galls.  It  gave  the 
qualitative  reactions  of  gallotannic  acid,  and  upon  ultimate  analysis 
showed  the  same  centesimal  composition  as  that  substance. 
Rhus  Copallina. — Unless  otherwise  specified  the  materials  of  this 
member  were  collected  at  Belmont,  near  Philadelphia,  in  1894.  The 
estimations  made  on  the  freshly  gathered  materials  showed  the 
following  figures : 
Part. 
Date  of 
Collection. 
Moisture. 
A.sh  in 
Absolutely 
Dry  Bark. 
Tannin  in 
Absolutely 
Dry  Bark. 
Remarks. 
Bark  of  root  . 
July  9 
50"53 
4-oo 
I3"94 
• 
Aug.  16 
50*03 
4*66 
14*84 
Bush  did  not  fruit  this  year. 
Sept.  16 
35'o6 
612 
8*62 
f  L,eaves   mostly   changed  in 
(  color. 
Oct.  16 
49  *°3 
5-94 
8*2/1 
0  Z4 
Leaves  deep  red  in  color. 
Inner  bark) 
of  stem  .  j 
July  13 
30*32 
7'36 
10*69 
f  Collected  iust  before  the  bush 
1  bloomed. 
Inner  bark) 
/-\f  cfptn  f 
\Jl     OlCLLL     •  J 
Aug.  16 
37"57 
5-17 
1 1 '61 
(Leaves   beginning   to  turn. 
Did  not  fruit  tliis  ycflt*. 
Inner  bark) 
of  stem  •  f 
Sept.  16 
11*09 
5-97 
6  04 
Leaves  mostly  turned. 
leaves   .  .  . 
June  4 
42-72 
3-52 
23*37 
Collected  at  St.  David's,  Pa. 
"  ... 
874 
4*16 
26*18 
Collected  in  Virginia. 
July  9 
52-43 
3*59 
29*32 
Pr*11ppff»H  fit  Rplmntit  Po 
V_UilCl-LCU  <X  L   DCllilUllL,    X  <X . 
41*00 
3-62 
33-90 
J  Fresh    leaves    gathered  in 
{    North  Carolina. 
9-36 
yf 
33*28 
[Same    lot    of    leaves  after 
\  ■  "  curing." 
n 
"  24 
56-44 
3-37 
42-5I 
[Belmont,     Pa.     Bushes  in 
\  bloom. 
Aug.  10 
12*39 
5'37 
1774 
f  Collected   at    Asbury  Park, 
1     N.  J. 
"  16 
23-98 
4-40 
33*28 
f  Belmont,  Pa.    Beginning  to 
|    change  color. 
Sept.  10 
7*64 
5'27 
20*24 
f  Collected   at    Asbury  Park, 
I    N.  J. 
"  16 
912 
5-66 
2949 
( Belmont,  Pa.  Mostly  changed 
{    in  color. 
Oct.  16 
10  04 
5*74 
32  39 
( Belmont,  Pa.    All  deep  red  in 
I  color. 
Flower  .  .  . 
July  13 
43-7I 
3-64 
48*85 
Collected  just  before  opening. 
Rhus  Semialata  and  Rhus  Canadensis. — The  examination  of 
some  material  from  these  species  showed  the  following  quantities: 
