Am.  Jour.  Pharm.  "j 
August,  1911.  j 
Digitalis  Hairs. 
369 
of  the  cardiac  substances  it  may  be  that  the  minute  study  of  the 
hairs  will  throw  some  light  on  the  variation  in  the  drug. 
As  has  been  already  stated  there  are  twO'  general  types  of  hairs 
in  digitalis,  (i)  non-glandular;  (2)  glandular.    Usually  the  former 
Fig.  3. 
Various  forms  of  hairs  ot  digitalis:  A,  vai'ious  forms  of  apical  cells;  B.  long  stalked  glandular 
hairs  very  common  in  leaves  of  cultivated  plants;  C,  various  non-glandular  hairs  showing 
crooked  or  bent  apical  cells;  D,  various  forms  of  glandular  hairs  with  short  stalks. 
occur  in  greatest  number  but  the  reverse  is  frequently  the  case, 
especially  in  cultivated  garden  varieties.  In  fact  I  have  seen  in 
certain  instances  the  glandular  hairs  so  numerous  that  I  was  inclined 
to  think  tliat  the  observations  previously  reported  and  the  illustra- 
tions made  were  erroneous.    The  non-glandular  hairs  are  usually 
