AmMarch',i898.rm'}  Asarum  Cauadense,  L.  145 
Everyone  who  has  had  anything  to  do  with  the  study  of  plants  in 
their  environment  has  observed  remarkable  differences  in  them 
depending  upon  the  conditions  of  soil  (both  physical  and  chemical), 
atmosphere,  light,  etc.;  and  when  the  plants  are  removed  from 
these  conditions  and  placed  under  similar  influences  to  a  similar 
degree,  that  these  differences  not  infrequently  disappear,  and  we 
Fig.  i.— Asarum  Cauadense,  h. 
have  become  better  acquainted  with  the  origin  of  the  forms  so 
different. 
The  discovery  of  an  additional  species,  in  an  old  species  of  medici- 
nal plants,  has  been  made  recently  by  Eugene  P.  Bicknell.  In  an 
article1  on  "A  new  species  of  wild  ginger  hitherto  confounded  with 
1  Bulletin  of  the  Torrey  Botanical  Club,  November,  1S97,  p.  528. 
