220 
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EXPLANATION OF PLATES IV AND V 
Plate IV 
Fig. I. Development of Puccinia Sorghi in carbon dioxide free atmosphere. 
a. Plant in carbon dioxide free atmosphere (uninfected), b. The check (infected). 
Fig. 2. Development of Puccinia Sorghi upon plants supplied with carbo- 
hydrates, a. Cane sugar 12 percent (infected), h. Cane sugar 6 percent (in- 
fected), c. Cane sugar 3 percent (infected), d. Cane sugar 3 percent plus 
Knop's mineral nutrient (uninfected), e. Knop's mineral nutrient (uninfected). 
/. Distilled water (uninfected). 
Plate V 
Fig. I. Pure culture of PMcama ^org/^z and its host. 
Fig. 2. Pure culture of Puccinia Sorghi upon cut pieces of corn leaf floated 
upon carbohydrate solution (looking down upon the capsules containing the leaves). 
