304  On  Wild  Cherry  Bark.  {^;& 
I  have  arranged  them  into  three  classes,  light)  medium,  and  dark, 
as  follows : 
Infusion  of  the  Bark  of  the  Tree  of  Wild  Cherry. 
Light.  Medium.  Dark. 
1st  month   January  
2d     "    February. 
3d     "    March.   
4th     "      April. 
5  th    «   May. 
6th    «     June.   
7th    «    July.   
8th    "    August  
9th    "   September  
10th  "        October. 
11th  "    November. 
12th  "    December  
The  bark  gathered  in  April,  October  and  November  form  the  dark- 
est preparations,  that  of  the  months  of  January  and  August  the  light- 
est, whilst  the  bark  of  the  remaining  months  form  various  shades  of 
medium  dark,  that  of  the  month  of  September  seeming  to  be  the 
darkest.  The  result  of  experiments  with  the  bark  of  the  root  vary 
considerably  from  those  with  the  bark  of  the  tree,  and  as  the  color  of 
the  infusion  is  decidedly  light  or  dark,  I  have  arranged  but  two 
classes,  the  light  being  a  pale  straw  color  and  the  dark  about  the  color 
of  the  darkest  of  the  medium  list  of  the  bark  of  the  tree. 
Infusion  of  the  Bark  of  the  Root  of  Wild  Cherry. 
Light.  Dark. 
1st  month   January.   
2d  "    February  
3d  "          March.   
4th  «    April. 
5th  "   May. 
6  th  "   June. 
7th  »    July. 
8th  "      August. 
9th  "  ,.  September. 
10th  «  .,   October. 
11th  "   ,   November  
12th  "    December  :  
The  darkest  seeming  to  be  the  months  of  May  and  October. 
After  precipitating  the  tannin  out  of  the  several  infusions,  and  find- 
ing this  principle  to  exist  in  the  ratio  of  color,  I  have  come  to  the  con- 
clusion, and  give  as  the  answer  to  the  43d  Query,  that  the  cause  of 
the  variance  in  the  color  of  cold  infusion  of  wild  cherry  bark  is  due  to 
the  existence  of  tannin  in  greater  or  less  quantity,  in  proportion  as 
the  infusion  is  dark  or  light,  and  suggest  that  this  difficulty  or  pecu- 
liarity can  be  avoided  by  due  attention  to  the  collection  of  the  bark. 
— Proceedings  Amer.  Pharm.  Assoc.,  1871. 
