20 BOTANICAL GAZEITE [JULY 
those fungi that live upon higher plants is favored by wet weather. 
This is so universally the case that we may almost conclude without 
further consideration that under normal conditions the water-relation 
of such parasites is of more importance in their development than any 
Fic. 1.—Asparagus rust, Puccinia Asparagi DC., in all stages. Milpitas, Calif. 
July 4, 1903. 
other condition. Considering this as established, there still remains 
1 broad field for research in determining just why this is true, and 
in general in analyzing the conditions and their results. This has 
been the writer’s object in the case of the destructive parasite Puc- 
hed Asparagi DC. ., Which has proved especially favorable for such 
study. 
