300 Wisconsin Academy of Sciences, Arts, and Letters. 
hit upon as such a plant. Examination of the old leaves showed that 
they had borne a rust the previous year. Then began the watching 
of the Carex eburnea plants in the vicinity of infected Shepherdia 
plants. Soon a few uredinia appeared on the culms speedily fol¬ 
lowed by abundant telia on culms and leaves. The following 
autumn a trip to the locality was made and abundant telial material 
on the Carex secured and seeds of Shepherdia which were kept in a 
box outdoors during the winter. It was during this winter, while 
attending a meeting of the American Association for the Advance¬ 
ment of Science that it was learned that Aecidium allenii had been 
connected with a grass rust in Colorado. However the following 
spring attempts were made to secure plants of Shepherdia cana¬ 
densis but without success. The seed would not germinate and no 
nursery was found that could supply plants. Some plants of 
Shepherdia argentea were obtained and attempts made to infect 
them but without success. Plants of Artemisia dracunculoides were 
also exposed to infection without result. Attempts to infect Shep¬ 
herdia argentea using teliospores of Puccinia coronata on Calama- 
grostis canadensis also failed. The next autumn another trip to 
the locality was made and in addition to telial material small plants 
of Shepherdia canadensis were secured which were brought to 
Madison and heeled in for the winter in what was thought to be a 
safe situation. On looking for them in the spring it was found that 
trucks had been running over them during the winter but two of 
the plants proved to be still alive. These were potted and taken 
into the greenhouse and one of them used for the infection experi¬ 
ment. The weather was very warm and no spore germination was 
observed in slide cultures and it was still hotter in the greenhouse. 
Nevertheless attempts were made to secure infection but without 
result. Finally in despair, the Shepherdia plant was transplanted 
to the garden and before leaving it the wisp of wet Carex leaves 
that had been suspended over it was drawn across two of the leaves 
on both surfaces. As it happened it turned quite cold that night 
and typical Aecidium allenii developed on the two leaves that had 
been smeared and on those leaves only. Again the locality was 
visited the next autumn and telial material and small plants of 
Shepherdia canadensis obtained and again the following spring 
telial germination was not secured. Still an attempt to infect 
in the greenhouse was made which finally resulted in a single but 
well developed aecidial spot bearing numerous cups. Examining 
this one day it was thought to be ready for plucking and pre- 
