Am.  Jour.  Fharm.  ) 
September,  1914.  / 
Rhamnus  Purshiana. 
389 
and  Clark,  as  is  possible  in  the  case  of  the  plant  o^  whose  medicinal 
value  they  must  have  learned  from  the  Indians,  had  brought  home 
seed,  these  might  very  well  have  produced  by  1838  trees  twenty  feet 
in  height. 
Fig.  i.— A  Cascara  tree  on  University  of  Washington  campus. 
Rhamnus  Purshiana  is  claimed  to  have  been  known  since  the 
early  part  of  the  nineteenth  century  to  the  Mexicans  and  Spanish 
priests  of  Old  California.    Tt  was  known  by  the  Spanish  name  of 
