The  work  on  plant  diseases  has  been  mostly  mycological.  Impor-
tant contributions  have  Ixjen  made  to  our  knowledge  of  prunicolous
Exoasceae  of  the  United  States.  Investigations  brought  to  light  some
undescril)ed  species  and  several  European  ones  not  heretofore  known
to  exist  in  this  country.  The  life  history  of  the  clover  ru*st  has
been  worked  out  and  remedial  measures  suggested.  Investigations
on  the  diseases  of  forest  trees  have  been  in  progress  for  some  time  and
connected  therewith  have  been  studies  on  the  development  of  certain'
of  those  trees,  especially  pines  and  other  conifers,  with  a  view  to  deter-
mining the  rate  of  growth,  distribution,  and  fertility  of  seed,  as  well
as  the  conditions  which  influence  or  modify  the  life  of  these  trees.
Investigations  have  been  made  on  a  number  of  entomogenous  fungi
and  the  practicability  of  using  artificial  cultures  of  them  in  com-
bating certain  insect  enemies  of  cultivated  plants.  Man}^  original
investigations  have  been  made  on  the  development  and  life  history  of
the  anthracnoses.  The  methods  of  technique  employed  in  the  culti-
vation and  study  of  these  forms  resulted  in  demonstrating  their  rela-
tionship to  higher  forms  and  brought  to  light  differential  characters
of  closely  related  species  not  heretofore  known  to  exist.  Observa-
tions have  been  made  on  the  habits  and  life  history  of  various  spe-
cies of  Cladosporium,  (7.  fidvum  on  the  tomato  in  particular.  Various
Pyrenomycetes  have  been  studied  with  a  view  to  tracing  their  devel-
opment and  polymorphy,  and  to  ascertaining  the  relationship  of
certain  pycnidial  and  conidial  forms.  The  life  histories  of  certain
fungi  which  cause  the  damping  off  of  seedlings  and  greenhouse
plants  have  been  worked  out  and  preventive  measures  suggested.
Among  these  was  one  fungus  which  was  first  described  at  this  station.
