Jan. 15, 1925 
Ecological Relations of the Smut of Maize 
171 
/9/& 
Fig. 2. —Graphic representation of production (weight of ears) per plant and percentage of smut jin 
sprayed and unsprayed plats in four successive seasons, 1916 to 1919 inclusive, at Manhattan, Kans. 
Where the curves are broken at aperpendicular, it is indicated that data on that chemical were not 
obtained in that year. Commercial white corn was used in these experiments 
