72 
North  American  Coniferce. 
(  Am.  Jour.  Pharm. 
\    February,  1896. 
little,  and  that  relatively  very  fine-grained.  The  wood  of  the  roots 
appeared  to  be  somewhat  richer  in  tannic  matters  than  that  of  the 
stems. 
V 
Fig.  12,  part  of  cross-section  of  stem  of  Pinus  Austriaca,  magnified  75  diame- 
ters; a,  epidermis;  b,  hypoderma;  c,  phellogen  layer  beginning  to  form;  d, 
secretion  reservoir  in  middle  bark;  e,  bast  layer;  f,  cambium  zone;  df >  secretion 
reservoir  in  wood;  t,  P tannin  cells.  All  of  the  cells  whose  contents  are 
strongly  shaded  contain  tannin. 
