324 
North  American  Conifer ce. 
Am.  Jour.  Pharm. 
June,  1896. 
species  already  described,  abounding  in  the  middle  and  inner  layers 
of  the  bark,  in  the  pith,  and  occurring  in  many  of  the  medullary 
ray  cells  of  the  xylem  and  in  the  secreting  cells  bounding  the  secre- 
tion reservoirs. 
The  secretion  reservoirs  appeared  to  be  not  less  abundant  than 
in  some  of  the  more  resinous  species,  but  the  oleoresinous  matters 
were  more  localized  in  the  secretion  reservoirs  and  the  cells  imme- 
diately surrounding  them,  and  less  diffused  through  other  tissues 
than  in  P.  palustris,  for  example. 
OCCURRENCE. 
This  tree  has  a  northerly  range,  occurring  in  Canada  and  in  the 
northern  United  States  from  Maine  to  Minnesota.  It  has  a  compact, 
hard,  not  very  resinous  wood,  which  is  durable  and  much  prized  for 
lumber. 
CHEMICAL  COMPOSITION. 
The  composition  of  Pinus  resinosa  has  been  investigated  so  far  as 
to  determine  the  percentages  of  tannin  and  mineral  constituents  in 
the  leaves,  stem  bark  and  root  bark,  with  the  following  results  : 
Moisture. 
Ash  in  abso- 
lutely dry 
substance. 
Tannin  in 
absolutely  dry 
substance. 
771 
2-28 
2'6o 
973 
2-65 
12*67 
1077 
2*67 
8-40 
The  ash  of  the  leaves  consisted  of  potassium,  calcium,  magne- 
sium, combined  with  phosphoric,  sulphuric  and  very  little  carbonic 
acid. 
The  ash  of  the  stem  bark  consisted  of  potassium  and  calcium 
carbonates,  phosphates  and  sulphates. 
The  ash  of  the  root  bark  was  found  to  be  composed  of  potassium 
and  calcium  phosphates,  sulphates  and  chlorides. 
The  samples  were  collected  near  Philadelphia,  in  November. 
ECONOMICS. 
No  record  appears  to  exist  of  the  use  of  the  bark  of  the  red  pine 
in  tanning,  although  the  percentage  of  tannin  would  indicate  the 
possibility  of  such  an  application.    Its  resin  is  also  abundant  and 
