THE  AMERICAN 
JOURNAL  OF  PHARMACY 
AUGUST,  i 
•    A  CONTRIBUTION  TO  THE  KNOWLEDGE  OF  SOME 
NORTH  AMERICAN  CONIFERS. 
By  Edson  S.  Bastin  and  Henry  Trimble. 
{Continued  from  page  386.) 
PICEA  ALBA,  LINK. 
CHEMICAL"  COM  POSITION. 
The  leaves,  stem  bark  and  root  bark  of  a  white  spruce  tree,  cut 
in  March,  1 896,  were  subjected  separately  to  a  proximate  analysis. 
The  following  are  the  percentage  results  on  the  moisture,  ash  and 
tannin : 
Moisture. 
Ash  in 
Absolutely 
Dry  Sample. 
Tannin  in 
Absolutely 
Dry  Sample. 
Leaves   
8-26 
5'29 
7-89 
8-17 
4;  1.1 
21-63 
872 
9-81 
1909 
The  ash  in  each  was  found  to  contain  potassium,  calcium  and 
iron,  combined  with  phosphoric,  sulphuric  and  carbonic  acids. 
The  foregoing  portions,  treated  with  absolute  alcohol,  yielded  the 
following  percentage  results  to  that  menstruum : 
Leaves                                                            .      .....  24-99 
Stem  bark   33 '25 
Root  bark   33 '49 
(409) 
